{ "151228-21911126": { "datetime_modified":"20260831T122442", "datetime_start":"20260909T143000", "datetime_end":"20260909T153000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"14:30:00", "time_end":"15:30:00", "time_zone":"America\/Detroit", "event_title":"Student Number Theory Seminar Planning Meeting", "occurrence_title":"", "combined_title":"Student Number Theory Seminar Planning Meeting", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Come to our first meeting of the semester (regardless of whether you're interested in giving a talk or not)! We'll discuss logistics, possible talk ideas, and set up a schedule for speakers this semester.", "occurrence_notes":null, "guid":"151228-21911126@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151228", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911126 } , "151716-21912023": { "datetime_modified":"20260908T152138", "datetime_start":"20260909T150000", "datetime_end":"20260909T160000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Student DGT: Hitomezashi Hypersurfaces", "occurrence_title":"", "combined_title":"Student DGT: Hitomezashi Hypersurfaces: Edwin Xie", "event_subtitle":"Edwin Xie", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Hitomezashi, a traditional Japanese stitching technique, has recently attracted mathematical interest for its combinatorial and geometric properties. We generalize hitomezashi patterns to arbitrary dimensions, allowing us to ask many (and answer several) questions about how a hitomezashi pattern's combinatorial data can determine its topological structure.", "occurrence_notes":null, "guid":"151716-21912023@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151716", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21912023 } , "149581-21906722": { "datetime_modified":"20260803T153429", "datetime_start":"20260909T160000", "datetime_end":"20260909T170000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Stability, Approximation, and Robustness of Optimal Policies in POMDPs", "occurrence_title":"", "combined_title":"Stability, Approximation, and Robustness of Optimal Policies in POMDPs: Yunus Emre Demirci, UM", "event_subtitle":"Yunus Emre Demirci, UM", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"In this talk, I will focus on the stability, approximation, and robustness of optimal policies in partially observable Markov decision processes (POMDPs) under discounted and average cost criteria.\n\nI will begin with filter kernel perturbation under model change. I will establish how small perturbations in the transition or observation kernels lead to explicit, nonasymptotic bounds on both the filter kernel and the performance of the induced policies. A primary result demonstrates that an optimal policy computed under an incorrect model remains near optimal for the true model, with quantitatively bounded errors.\n\nBuilding on these stability concepts, I will then talk about the average cost setting and describe conditions under which the nonlinear filter exhibits a contraction property. Under these conditions, the vanishing discounted approach yields a solution to the average cost optimality equation, guaranteeing the existence of a stationary optimal policy. Furthermore, this provides explicit bounds that quantify the influence of initial prior distribution errors and model errors on long run performance.\n\nFinally, I will present results on implementable approximations. I will introduce refined error bounds for finite window controllers and conclude by discussing how Q learning can be utilized through either finite window or the quantization of the belief process to obtain near optimal policies for both discounted and average cost criteria.", "occurrence_notes":null, "guid":"149581-21906722@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149581", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906722 } , "151180-21911039": { "datetime_modified":"20260901T081333", "datetime_start":"20260909T160000", "datetime_end":"20260909T170000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Probability and Analysis Seminar: A Riemann-Hilbert approach to Dyson Brownian motion and Gaussian multiplicative chaos", "occurrence_title":"", "combined_title":"Probability and Analysis Seminar: A Riemann-Hilbert approach to Dyson Brownian motion and Gaussian multiplicative chaos: Nathan Hayford (Umich)", "event_subtitle":"Nathan Hayford (Umich)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: The connection between random matrices and Gaussian multiplicative chaos (GMC) has been studied intensively since the work of Fyodorov and Keating (2014). There has been recent interest in the appearance of GMC in dynamical ensembles of random matrices and their eigenvalues, such as the Dyson Brownian motion (Keles 2025). We propose a Riemann-Hilbert approach to this problem. I will explain how our approach allows one to probe the \u201cmicroscopic scale\u201d (a scale which is inaccessible via loop equations), where the appearance of Painlev\u00e9 transcendents is anticipated. This is joint work with Ahmad Barhoumi.", "occurrence_notes":null, "guid":"151180-21911039@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151180", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911039 } , "151640-21911885": { "datetime_modified":"20260906T010254", "datetime_start":"20260909T160000", "datetime_end":"20260909T170000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Student AIM Seminar: Planning Meeting", "occurrence_title":"", "combined_title":"Student AIM Seminar: Planning Meeting", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Hope you had a wonderful summer break, and welcome to the new semester! The Student AIM Seminar will be holding a planning meeting on Wednesday, September 9 from 4-5 pm in East Hall 3088. We'd love to hear about your ideas about any social\/professional event ideas, research topics, or speakers that you'd like us to facilitate for this semester. We especially encourage first-year PhD students to attend.", "occurrence_notes":null, "guid":"151640-21911885@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151640", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Applied Mathematics"], "website":"https:\/\/sites.google.com\/umich.edu\/umich-siamstudentchapter\/home?authuser=0", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/09\/event_151640_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_thumb\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/09\/event_151640_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/09\/event_151640_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/09\/event_151640_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/09\/event_151640_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/09\/event_151640_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/09\/event_151640_original-1.png" }, "occurrence_count":1, "first_occurrence":21911885 } , "151566-21911774": { "datetime_modified":"20260904T113945", "datetime_start":"20260910T100000", "datetime_end":"20260910T110000", "has_end_time":1, "date_start":"2026-09-10", "date_end":"2026-09-10", "time_start":"10:00:00", "time_end":"11:00:00", "time_zone":"America\/Detroit", "event_title":"Descriptive set theory", "occurrence_title":"", "combined_title":"Descriptive set theory: Scott Schneider", "event_subtitle":"Scott Schneider", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Research seminar on descriptive set theory. The first several talks will be by Scott Schneider on his work on Borel equivalence relations generated by families of commuting functions.", "occurrence_notes":null, "guid":"151566-21911774@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151566", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"5822", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911774 } , "151631-21911873": { "datetime_modified":"20260908T115014", "datetime_start":"20260910T153000", "datetime_end":"20260910T170000", "has_end_time":1, "date_start":"2026-09-10", "date_end":"2026-09-10", "time_start":"15:30:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Preprint Seminar", "occurrence_title":"", "combined_title":"Algebraic Geometry Preprint Seminar: Organizational meeting", "event_subtitle":"Organizational meeting", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"None", "occurrence_notes":null, "guid":"151631-21911873@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151631", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911873 } , "149190-21905948": { "datetime_modified":"20260815T160439", "datetime_start":"20260910T160000", "datetime_end":"20260910T170000", "has_end_time":1, "date_start":"2026-09-10", "date_end":"2026-09-10", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"DE Seminar: Mathematical Analysis of Many-Body Quantum Simulation with Coulomb Potentials", "occurrence_title":"", "combined_title":"DE Seminar: Mathematical Analysis of Many-Body Quantum Simulation with Coulomb Potentials: Di Fang (Duke)", "event_subtitle":"Di Fang (Duke)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Efficient simulation of many-body quantum dynamics is central to advances in physics, chemistry, and quantum computing. A fundamental question is whether the simulation cost can scale polynomially with system size in the presence of realistic interactions. In this talk, we focus on many-body quantum systems with Coulomb interactions, which play a central role in electronic and molecular dynamics. We prove that first-order Trotterization for such unbounded Hamiltonians admits a polynomial dependence on the number of particles in the continuum limit, with a convergence rate of order $1\/4$\u2014in contrast to prior Trotter analyses for bounded operators, which diverge in this limit. The result holds for all initial wavefunctions in the domain of the Hamiltonian. This $1\/4$-order rate is optimal, as previous work shows that it can be saturated by the ground state of the hydrogen atom. Moreover, higher-order Trotter formulas do not improve the worst-case scaling. We also discuss additional regularity conditions on the initial state under which the original Trotter convergence rate can be recovered. Finally, we discuss our recent development on the spatial error and algorithm complexities.", "occurrence_notes":null, "guid":"149190-21905948@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149190", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Applied Mathematics","Mathematics","Quantum"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21905948 } , "148388-21904175": { "datetime_modified":"20260903T145225", "datetime_start":"20260911T150000", "datetime_end":"20260911T160000", "has_end_time":1, "date_start":"2026-09-11", "date_end":"2026-09-11", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Type C multiline queues and the open-boundary TASEP", "occurrence_title":"", "combined_title":"Type C multiline queues and the open-boundary TASEP: Olya Mandelshtam (Waterloo)", "event_subtitle":"Olya Mandelshtam (Waterloo)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"The multispecies TASEP on a circle is a particle model whose partition function is connected to Macdonald polynomials at t=0. Multiline queues were introduced by Ferrari and Martin (2007) to compute the stationary distribution of the TASEP on a circle. Their construction admits a natural interpretation in terms of tensor products of Kirillov\u2013Reshetikhin crystals of affine type A, and a map from these tensor products to TASEP states is given by crystal-theoretic operations. We show that there is a natural Markov chain on the crystal that projects to the TASEP via this map.\nThe multispecies open boundary TASEP can be viewed as a type C analogue, with its partition function connected to Koornwinder polynomials at t=0. However, computing its stationary distribution beyond rank 1 has remained a longstanding open problem. Using Kirillov\u2013Reshetikhin crystals of affine type C, we construct type C multiline queues and a corresponding Ferrari\u2013Martin pairing algorithm, and show the crystal likewise admits a Markov chain that projects to the TASEP. Our construction is a combinatorial interpretation of the virtualization map for Kashiwara\u2013Nakashima columns. We thus obtain a crystal-theoretic formula for the stationary distribution of the multispecies open boundary TASEP at the specialization alpha=beta=1. This is joint work with Jeronimo Valencia Porras.", "occurrence_notes":null, "guid":"148388-21904175@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148388", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21904175 } , "148873-21905035": { "datetime_modified":"20260810T205616", "datetime_start":"20260911T150000", "datetime_end":"20260911T160000", "has_end_time":1, "date_start":"2026-09-11", "date_end":"2026-09-11", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Pseudo-magnetism in a strained discrete honeycomb lattice", "occurrence_title":"", "combined_title":"Pseudo-magnetism in a strained discrete honeycomb lattice: Xuenan Li (Mathematics, Purdue University)", "event_subtitle":"Xuenan Li (Mathematics, Purdue University)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: Slowly-varying nonuniform strain in honeycomb media can generate an effective pseudo-magnetic field, even though the underlying medium is non-magnetic. This phenomenon was first discovered in graphene and later in photonic crystals, and other physical settings. In this talk, I will start from a discrete nearest-neighbor tight-binding model for a nonuniformly strained honeycomb medium. I will then show how this model leads to a continuum magnetic Dirac Hamiltonian that describes wave packets concentrated near a Dirac point of the undeformed structure. I will focus on unidirectional deformations with bounded gradients that preserve translation invariance along the armchair direction. In this setting, we prove the existence of eigenmodes that behave like plane waves along the armchair direction and are strongly localized in the transverse direction, together with quantitative correction estimates. These results apply to deformations that produce an approximately constant pseudo-magnetic field perpendicular to the plane. They also lead to nearly flat bands and, as a consequence, a very high density of states. These analytical results are also supported by numerical simulations of the corresponding deformations. This is joint work with Michael I. Weinstein.\n\nContact: Ian Tobasco", "occurrence_notes":null, "guid":"148873-21905035@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148873", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1084", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Applied Mathematics","Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21905035 } , "151678-21911940": { "datetime_modified":"20260908T002719", "datetime_start":"20260911T150000", "datetime_end":"20260911T160000", "has_end_time":1, "date_start":"2026-09-11", "date_end":"2026-09-11", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Student Algebraic Geometry: Reconstruction Theorems", "occurrence_title":"", "combined_title":"Student Algebraic Geometry: Reconstruction Theorems: Ritwick Bhargava", "event_subtitle":"Ritwick Bhargava", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Gabriel's reconstruction theorem states that a noetherian scheme can be fully recovered from its abelian category of quasi-coherent sheaves. This motivates noncommutative algebraic geometry, which advocates viewing any abelian category as a category of sheaves on a \"noncommutative space\". I will sketch two approaches to the proof and discuss extensions to the derived and stacky settings.", "occurrence_notes":null, "guid":"151678-21911940@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151678", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"2866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911940 } , "151802-21912194": { "datetime_modified":"20260908T184739", "datetime_start":"20260914T150000", "datetime_end":"20260914T160000", "has_end_time":1, "date_start":"2026-09-14", "date_end":"2026-09-14", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Math Grad Show and Tell Seminar: Theoretical Crochet: A crossroads of graph theory, geometry, and cat toys", "occurrence_title":"", "combined_title":"Math Grad Show and Tell Seminar: Theoretical Crochet: A crossroads of graph theory, geometry, and cat toys: Renato Pinto Reveggino", "event_subtitle":"Renato Pinto Reveggino", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"In this talk I explain how I got into the hobby, and how I later learned that any crochet pattern can be expressed as a graph. Therefore any appropriate graph can be turned into a crochet pattern. Learn which graphs lead to which shapes when we keep all edges the same length, thereby uncovering the unprecedented utility of the single-stitch crochet. This could also be seen as a study on all surfaces one can build with equilateral triangles. 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The talk will focus on the interaction between optimal contracting, information acquisition, and market efficiency, together with the economic intuition underlying these results.", "occurrence_notes":null, "guid":"149582-21906724@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149582", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906724 } , "151181-21911040": { "datetime_modified":"20260909T203739", "datetime_start":"20260916T160000", "datetime_end":"20260916T170000", "has_end_time":1, "date_start":"2026-09-16", "date_end":"2026-09-16", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Probability and Analysis Seminar: Non-abelian Hirota\u2013Miwa Equations for the KPZ Universality Class", "occurrence_title":"", "combined_title":"Probability and Analysis Seminar: Non-abelian Hirota\u2013Miwa Equations for the KPZ Universality Class: C. 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The first several talks will be by Scott Schneider on his work on Borel equivalence relations generated by families of commuting functions.", "occurrence_notes":null, "guid":"151567-21911775@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151567", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"5822", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911775 } , "149350-21906263": { "datetime_modified":"20260902T091907", "datetime_start":"20260917T160000", "datetime_end":"20260917T170000", "has_end_time":1, "date_start":"2026-09-17", "date_end":"2026-09-17", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Stephen DeBacker, the Mahendra Parekh Director of the Center for Inquiry Based Learning, Arthur F. Thurnau Professor of Mathematics, Inaugural Lecture", "occurrence_title":"", "combined_title":"Stephen DeBacker, the Mahendra Parekh Director of the Center for Inquiry Based Learning, Arthur F. Thurnau Professor of Mathematics, Inaugural Lecture", "event_subtitle":"", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Even the Greeks ...\n\nA discussion of Inquiry Based Learning at Michigan\n\nThis event will be delivered both in person and virtually. \n\nThis talk is about Inquiry-Based Learning (IBL), a pedagogical method that emphasizes discovery, analysis, and investigation as means of deepening students\u2019 understanding of mathematical ideas and applications. Following a brief survey of the history of IBL at the University of Michigan, we will attempt both to convey the power of IBL and to explain the meaning of the talk\u2019s title through an immersive experience. I will conclude with reflections drawn from my own teaching and learning experiences.\n\nIf you are unable to join us in person, \nJoin from PC, Mac, iPad, or Android:\nhttps:\/\/umich.zoom.us\/j\/99717161623\n\nPhone one-tap:\n+16469313860,,99717161623# US\n+13017158592,,99717161623# US (Washington DC)\n\nJoin via audio:\n+1 646 931 3860 US\n+1 301 715 8592 US (Washington DC)\n+1 305 224 1968 US\n+1 309 205 3325 US\n+1 312 626 6799 US (Chicago)\n+1 646 876 9923 US (New York)\n+1 689 278 1000 US\n+1 719 359 4580 US\n+1 253 205 0468 US\n+1 253 215 8782 US (Tacoma)\n+1 346 248 7799 US (Houston)\n+1 360 209 5623 US\n+1 386 347 5053 US\n+1 507 473 4847 US\n+1 564 217 2000 US\n+1 669 444 9171 US\n+1 669 900 6833 US (San Jose)\n+1 778 907 2071 Canada\n+1 780 666 0144 Canada\n+1 204 272 7920 Canada\n+1 438 809 7799 Canada\n+1 587 328 1099 Canada\n+1 647 374 4685 Canada\n+1 647 558 0588 Canada\nWebinar ID: 997 1716 1623\nInternational numbers available: https:\/\/umich.zoom.us\/u\/axMP7qvbv", "occurrence_notes":"A public reception immediately following", "guid":"149350-21906263@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149350", "building_id":"1000150", "building_name":"LSA Building", "campus_maps_id":"87", "room":"Multipurpose Room #1040", "location_name":"LSA Building", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/07\/event_149350_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/07\/event_149350_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/07\/event_149350_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/07\/event_149350_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/07\/event_149350_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/07\/event_149350_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/07\/event_149350_original-1.png" }, "occurrence_count":1, "first_occurrence":21906263 } , "148874-21905036": { "datetime_modified":"20260810T205656", "datetime_start":"20260918T150000", "datetime_end":"20260918T160000", "has_end_time":1, "date_start":"2026-09-18", "date_end":"2026-09-18", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Foundation models and agentic AI for discovery in fluid mechanics", "occurrence_title":"", "combined_title":"Foundation models and agentic AI for discovery in fluid mechanics: Ricardo Vinuesa (Aerospace Engineering, University of Michigan)", "event_subtitle":"Ricardo Vinuesa (Aerospace Engineering, University of Michigan)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: In this seminar we discuss a unified framework that combines explainable deep learning, deep reinforcement learning (DRL) and foundation models to advance both understanding and control of turbulence, with direct implications for accelerated design and discovery. First, we will show how explainable deep learning techniques can be used to identify the flow features that are truly responsible for key turbulent processes in wall-bounded flows. By systematically interrogating trained neural networks, we uncover the most influential coherent structures driving momentum transport and drag. Our results reveal that classically studied structures (while important) provide only a partial and sometimes misleading perspective, motivating a more data-driven and physics-aware view of turbulence organization. Building on these insights, we will demonstrate how deep reinforcement learning can be used to actively control turbulent flows by targeting the dynamically relevant structures identified through explainability. This approach achieves over 30% drag reduction in canonical wall-bounded turbulence and extends naturally to more complex configurations, including turbulent wings, highlighting the scalability of learning-based control strategies. Finally, we will introduce a foundation-model-based framework for accelerated design, optimization and scientific discovery. By learning compact, interpretable latent representations of high-dimensional flow physics, these models (combined with agentic-AI systems) enable rapid exploration of design spaces, causal reasoning and closed-loop optimization, bridging the gap between expensive simulations, control and engineering decision making. Together, these results illustrate how explainable and agentic AI are becoming essential for turbulence physics, flow control and next-generation engineering design.\n\n\nContact: Silas Alben", "occurrence_notes":null, "guid":"148874-21905036@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148874", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1084", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Applied Mathematics","Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21905036 } , "149342-21906254": { "datetime_modified":"20260908T142951", "datetime_start":"20260918T150000", "datetime_end":"20260918T160000", "has_end_time":1, "date_start":"2026-09-18", "date_end":"2026-09-18", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Extremal set theory as algebraic geometry", "occurrence_title":"", "combined_title":"Extremal set theory as algebraic geometry: Russ Woodroofe (University of Primorska)", "event_subtitle":"Russ Woodroofe (University of Primorska)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Extremal set theory asks questions such as \"what is the largest family of pairwise intersecting k-element subsets of an n-element set?\" Many questions of this type can be modeled with exterior algebras, and admit extensions such as \"what is the largest self-annihilating subspace of k-forms in an n-variable exterior algebra?\" The shifting technique in extremal set theory corresponds to algebraic geometric limits of certain curves in a Grassmannian.\n\nIn this talk, I will overview these connections, and go on to discuss recent joint work with Bulavka and Gandini. We find a maximum subspace of k-forms in an n-variable exterior algebra that is self-annihilating but not annihilated by any 1-form. A difficulty is that \"not annihilated by any 1-form\" is not a closed condition in the Grassmannian. This work extends the Hilton-Milner theorem of extremal set theory to the exterior algebra setting, and answers questions of Scott and Wilmer and of my own.", "occurrence_notes":null, "guid":"149342-21906254@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149342", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906254 } , "149737-21907014": { "datetime_modified":"20260801T084552", "datetime_start":"20260921T160000", "datetime_end":"20260921T170000", "has_end_time":1, "date_start":"2026-09-21", "date_end":"2026-09-21", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"TBA", "occurrence_title":"", "combined_title":"TBA: Kaiwen Lu, Brown University", "event_subtitle":"Kaiwen Lu, Brown University", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"TBA", "occurrence_notes":null, "guid":"149737-21907014@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149737", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Dynamics","Number Theory"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21907014 } , "151698-21911991": { "datetime_modified":"20260908T111308", "datetime_start":"20260921T160000", "datetime_end":"20260921T170000", "has_end_time":1, "date_start":"2026-09-21", "date_end":"2026-09-21", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"TBA", "occurrence_title":"", "combined_title":"TBA: Jonathan Love (UM)", "event_subtitle":"Jonathan Love (UM)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBA", "occurrence_notes":null, "guid":"151698-21911991@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151698", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911991 } , "151704-21912002": { "datetime_modified":"20260908T113212", "datetime_start":"20260921T160000", "datetime_end":"20260921T170000", "has_end_time":1, "date_start":"2026-09-21", "date_end":"2026-09-21", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"GLNT+Dynamics: TBA", "occurrence_title":"", "combined_title":"GLNT+Dynamics: TBA: Kaiwen Lu (Brown)", "event_subtitle":"Kaiwen Lu (Brown)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBD", "occurrence_notes":"***Note the special room!!***", "guid":"151704-21912002@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151704", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21912002 } , "149714-21906987": { "datetime_modified":"20260731T102241", "datetime_start":"20260923T153000", "datetime_end":"20260923T165000", "has_end_time":1, "date_start":"2026-09-23", "date_end":"2026-09-23", "time_start":"15:30:00", "time_end":"16:50:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Seminar -- TBA", "occurrence_title":"", "combined_title":"Algebraic Geometry Seminar -- TBA: Caleb Ji, University of Michigan", "event_subtitle":"Caleb Ji, University of Michigan", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBA", "occurrence_notes":null, "guid":"149714-21906987@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149714", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906987 } , "149578-21906720": { "datetime_modified":"20260727T104702", "datetime_start":"20260923T160000", "datetime_end":"20260923T170000", "has_end_time":1, "date_start":"2026-09-23", "date_end":"2026-09-23", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Buying Time: Optimal Service Purchase and Retirement Timing in Defined Benefit Plans", "occurrence_title":"", "combined_title":"Buying Time: Optimal Service Purchase and Retirement Timing in Defined Benefit Plans: Kristen Moore, UM", "event_subtitle":"Kristen Moore, UM", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"We study retirement timing decisions in a defined benefit (DB) pension plan with a service-purchase\noption. An employee who would otherwise retire at a fixed time T may elect to purchase L additional\nyears of service and retire early. Earlier retirement provides additional leisure but requires an upfront\npayment and typically results in a reduced post-retirement income stream. We model this trade-off in\na continuous-time retirement framework by allowing the employee to choose L to maximize the value\nof wealth and leisure at retirement in both deterministic and life-contingent settings. Our model\ncaptures a common feature of public pension systems: early retirement is often accompanied by both\nan upfront cost and a permanent reduction in benefits. We show that this structure yields tractable\nand intuitive results in several benchmark cases, including settings without mortality risk and settings\nwith mortality risk under simplifying assumptions. In more general cases, we characterize optimal\nbehavior through comparative statics and numerical examples. A key insight is that the interaction\nbetween the finite-horizon value of leisure and the lifetime cost embedded in pension pricing can\ngenerate a range of behaviors, including monotone strategies and interior optima. While many results\nalign with economic intuition, others require more careful interpretation. We also extend the model to\nallow for dynamic decision-making via a multi-period service-purchase option, solved by backward\ninduction. The results provide insight into optimal retirement timing and the role of plan design in\nshaping participant behavior. This is joint work with David Kausch and Virginia Young.", "occurrence_notes":null, "guid":"149578-21906720@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149578", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906720 } , "150235-21908433": { "datetime_modified":"20260813T140612", "datetime_start":"20260923T160000", "datetime_end":"20260923T172000", "has_end_time":1, "date_start":"2026-09-23", "date_end":"2026-09-23", "time_start":"16:00:00", "time_end":"17:20:00", "time_zone":"America\/Detroit", "event_title":"RTG SEMINAR GEOMETRY, TOPOLOGY, DYNAMICS: Global Rigidity of Codimenson 1 Actions", "occurrence_title":"", "combined_title":"RTG SEMINAR GEOMETRY, TOPOLOGY, DYNAMICS: Global Rigidity of Codimenson 1 Actions: Camilo Arosemena", "event_subtitle":"Camilo Arosemena", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBA", "occurrence_notes":null, "guid":"150235-21908433@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150235", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21908433 } , "151182-21911041": { "datetime_modified":"20260830T165053", "datetime_start":"20260923T160000", "datetime_end":"20260923T170000", "has_end_time":1, "date_start":"2026-09-23", "date_end":"2026-09-23", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Probability and Analysis Seminar: TBA", "occurrence_title":"", "combined_title":"Probability and Analysis Seminar: TBA: Roger Van Peski (Columbia University)", "event_subtitle":"Roger Van Peski (Columbia University)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBA", "occurrence_notes":null, "guid":"151182-21911041@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151182", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911041 } , "149234-21906025": { "datetime_modified":"20260705T154311", "datetime_start":"20260924T160000", "datetime_end":"20260924T170000", "has_end_time":1, "date_start":"2026-09-24", "date_end":"2026-09-24", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"GEOMETRY SEMINAR: TBA", "occurrence_title":"", "combined_title":"GEOMETRY SEMINAR: TBA: Homin Lee", "event_subtitle":"Homin Lee", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBA", "occurrence_notes":null, "guid":"149234-21906025@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149234", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3860", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906025 } , "148875-21905037": { "datetime_modified":"20260908T134834", "datetime_start":"20260925T150000", "datetime_end":"20260925T160000", "has_end_time":1, "date_start":"2026-09-25", "date_end":"2026-09-25", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Discrete structure, continuous dynamics: Graph-theoretic approaches and singular parametric limits in biochemical reaction networks", "occurrence_title":"", "combined_title":"Discrete structure, continuous dynamics: Graph-theoretic approaches and singular parametric limits in biochemical reaction networks: Sabina Haque (Mathematics, University of Michigan)", "event_subtitle":"Sabina Haque (Mathematics, University of Michigan)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: A biochemical reaction network is based on a discrete object: a directed graph whose edges are labeled with reaction rates. At the same time, it is governed by continuous dynamics, typically expressed as a nonlinear system of polynomial ODEs. These two descriptions encode the same system but have fundamentally different mathematical structures. This mathematical tension raises the question: how does the discrete structure of a biochemical network govern its continuous dynamics? In this talk, I will explore this question through several examples at the intersection of graph theory, dynamical systems, and applied algebraic geometry. In particular, I will focus on singular limits in which reaction-rate parameters tend to infinity. These limits motivate a graph operation that resembles an edge contraction, and I will examine their effects on graph invariants expressed as rational functions of the model parameters. I will then extend this construction to structural identifiability and discuss how model reduction alters the geometry of parameter space. Finally, I will turn to a stochastic interpretation of this graph-theoretic framework and describe how asymmetry in the spectral decomposition of a finite-state continuous-time Markov process gives rise to a signature of departure from thermodynamic equilibrium, with unexpectedly nonmonotone behavior even on the simplest networks. I will conclude with a discussion of broader future directions focused on understanding how network operations may affect qualitative dynamical properties of the system. Together, these examples illustrate how biologically inspired networks generate subtle structural questions and new mathematics at the interface of discrete and continuous systems.\n\nContact: Zhiyan Ding", "occurrence_notes":null, "guid":"148875-21905037@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148875", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1084", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Applied Mathematics","Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, 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"date_end":"2026-09-29", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Colloquium: TBA", "occurrence_title":"", "combined_title":"Colloquium: TBA: Jalal Shatah, NYU Courant", "event_subtitle":"Jalal Shatah, NYU Courant", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"TBA", "occurrence_notes":null, "guid":"149288-21906196@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149288", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"https:\/\/math.nyu.edu\/people\/profiles\/SHATAH_Jalal.html", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", 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"campus_maps_id":"53", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906898 } , "149663-21906910": { "datetime_modified":"20260729T153011", "datetime_start":"20260930T160000", "datetime_end":"20260930T170000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Quantitative propagation of chaos and universality for asymmetric Langevin spin glass dynamics", "occurrence_title":"", "combined_title":"Quantitative propagation of chaos and universality for asymmetric Langevin spin glass dynamics: Manuel Arnese", "event_subtitle":"Manuel Arnese", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"We obtain quantitative estimates on quenched propagation of chaos for Langevin spin glass dynamics with i.i.d. disorder. Prior work in the case of Gaussian disorder established the qualitative convergence of the law of a single spin to a deterministic McKean--Vlasov limit. We prove convergence rates in expected Wasserstein distance and quantitative concentration rates for Lipschitz observables under the assumption that the disorder satisfies the T_2 inequality. The proof uses a coupling argument, together with techniques from concentration of measure, filtering theory, and Malliavin calculus.", "occurrence_notes":null, "guid":"149663-21906910@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149663", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906910 } , "150309-21909000": { 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"combined_title":"Title TBA: Mitchell Luskin (Mathematics, University of Minnesota)", "event_subtitle":"Mitchell Luskin (Mathematics, University of Minnesota)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: TBA\n\nContact: Ian Tobasco", "occurrence_notes":null, "guid":"148876-21905038@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148876", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1084", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Applied Mathematics","Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", 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Seminar", "event_type_id":"21", "description":"Abstract: TBA", "occurrence_notes":null, "guid":"149808-21907215@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149808", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21907215 } , "141373-21888712": { "datetime_modified":"20260407T124520", "datetime_start":"20261007T160000", "datetime_end":"20261007T170000", "has_end_time":1, "date_start":"2026-10-07", "date_end":"2026-10-07", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Robust and Risk-Sensitive Acceleration in Gradient Methods", "occurrence_title":"", "combined_title":"Robust and Risk-Sensitive Acceleration in Gradient Methods: Mert Gurbuzbalaban, Rutgers", "event_subtitle":"Mert Gurbuzbalaban, Rutgers", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"First-order methods such as gradient descent (GD) are foundational in optimization. In unconstrained problems with exact gradients, momentum-based methods\u2014most notably Nesterov\u2019s accelerated gradient descent (AGD) and Polyak\u2019s heavy-ball (HB) method\u2014achieve faster convergence by improving dependence on the condition number. However, this acceleration comes at a cost: momentum amplifies gradient noise, making these methods less robust than GD under standard parameter choices and requiring more accurate gradient estimates to attain comparable accuracy. Similar challenges arise in convex and nonconvex min\u2013max optimization.\nMotivated by applications in machine learning, this talk studies unconstrained and min\u2013max optimization under deterministic, unbiased stochastic, and biased stochastic gradient noise. I will present new algorithms that achieve optimal robustness against different noise types, using control-theoretic tools such as the H_2\u200b norm, the H_\u221e\u200b norm, and the risk-sensitivity index, together with coherent risk measures. I will also discuss worst-case noise constructions and high-probability convergence guarantees. This perspective builds a bridge between optimization and robust control theory and enables the design of noise-robust and risk-sensitive accelerated methods.\nRepresentative Publications:\nM. G\u00fcrb\u00fczbalaban, Y. Syed, N. S. Aybat, Accelerated gradient methods with biased gradient estimates: Risk sensitivity, high-probability guarantees, and large deviation bounds, Journal of Nonlinear and Variational Analysis, 2026 (Special Issue). https:\/\/jnva.biemdas.com\/archives\/2927\nM. G\u00fcrb\u00fczbalaban, Robustly Stable Accelerated Momentum Methods with a Near-Optimal L_2\u200b Gain and H_\u221e\u200b Performance, Mathematics of Operations Research, 2025.\nhttps:\/\/pubsonline.informs.org\/doi\/abs\/10.1287\/moor.2023.0321\nB. Can and M. 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