{ "152928-21914808": { "datetime_modified":"20260927T143952", "datetime_start":"20260930T143000", "datetime_end":"20260930T153000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"14:30:00", "time_end":"15:30:00", "time_zone":"America\/Detroit", "event_title":"Learning Seminar in Algebraic Combinatorics", "occurrence_title":"", "combined_title":"Learning Seminar in Algebraic Combinatorics: Plane Partitions (Yucong Lei)", "event_subtitle":"Plane Partitions (Yucong Lei)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"In this talk, I will introduce a class of combinatorial objects called plane partitions, which describe pilings of cubes n a corner. I will present various enumeration formulas for plane partitions, derived from non-intersecting path families, and illustrate their connections to Schur functions.", "occurrence_notes":null, "guid":"152928-21914808@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152928", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"https:\/\/gtbarkley.org\/seminars\/latticemodels26\/", "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/09\/event_152928_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/09\/event_152928_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/09\/event_152928_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/09\/event_152928_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/09\/event_152928_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/09\/event_152928_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_thumb\/media\/attachments\/2026\/09\/event_152928_original-1.png" }, "occurrence_count":1, "first_occurrence":21914808 } , "152988-21914867": { "datetime_modified":"20260928T123901", "datetime_start":"20260930T150000", "datetime_end":"20260930T160000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Student DGT: Convexity in a complex world", "occurrence_title":"", "combined_title":"Student DGT: Convexity in a complex world: David Cutler", "event_subtitle":"David Cutler", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Complex geometry is a cornerstone of contemporary mathematics; convex geometry, by contrast, has remained fairly niche since its modern inception in the early 20th century. Nonetheless, the two subjects are related by numerous extremely deep correspondences. Even more bizarrely, these correspondences tend to end up being more \"useful\" on the complex side, suggesting that there is some \"structure\" on the complex side that is somehow more naturally analyzed through its convex counterpart. In this talk, we will sample some results from this fascinating history before discussing a \"convex\" approach to studying K\u00e4hler\u2013Einstein metrics.", "occurrence_notes":null, "guid":"152988-21914867@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152988", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Geometry","Topology"], "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":21914867 } , "149657-21906898": { "datetime_modified":"20260922T115750", "datetime_start":"20260930T153000", "datetime_end":"20260930T165000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"15:30:00", "time_end":"16:50:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Seminar: Crepant resolutions via stacks", "occurrence_title":"", "combined_title":"Algebraic Geometry Seminar: Crepant resolutions via stacks: Jeremy Usatine, Florida State University", "event_subtitle":"Jeremy Usatine, Florida State University", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Consider an invariant that behaves nicely for smooth varieties, such as Euler number, Betti numbers, or Hodge numbers. Suppose we want a version of this invariant for singular varieties that sees interesting information about the singularities. I will discuss how this naturally leads to the notion of crepant resolutions of singularities. However, crepant resolutions (by varieties) are rare in practice. I will discuss joint work with M. Satriano in which we show that crepant resolutions actually exist in broad generality, as long as one is willing to consider algebraic stacks. Specifically, any variety with log-terminal singularities admits a crepant resolution by a smooth algebraic stack. As one consequence, in joint work with J. Huang and M. Satriano, we obtain a cohomological interpretation for Batyrev's stringy Hodge numbers. This talk will not assume familiarity with stacks.", "occurrence_notes":null, "guid":"149657-21906898@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149657", "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":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": { "datetime_modified":"20260921T102748", "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":"Geometry-Topology RTG Seminar: Stability Patterns for Spherical Braid Groups", "occurrence_title":"", "combined_title":"Geometry-Topology RTG Seminar: Stability Patterns for Spherical Braid Groups: Sarah Anderson (Purdue)", "event_subtitle":"Sarah Anderson (Purdue)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: Stability patterns for the homology of configuration spaces has been studied for decades, starting with homological stability in the 1970's, then representation stability in 2010, and stable periodicity in 2015. When the configuration spaces are Eilenberg-MacLane spaces, these stability results extend to the group homology of surface braid groups. However, configuration spaces on S^2 and RP^2 are not Eilenberg-MacLane spaces and so the stability patterns for their group homology had not yet been established. In this talk, I will use a result from Fred Cohen and Jonathan Pakianathan as well as the theory of FI-homology to establish stability patterns for the group homology of braid groups on S^2 and RP^2.", "occurrence_notes":null, "guid":"150309-21909000@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150309", "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":"https:\/\/events.umich.edu\/media\/attachments\/2026\/08\/event_150309_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_thumb\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_thumb\/media\/attachments\/2026\/08\/crop-event_150309_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21909000 } , "152870-21914627": { "datetime_modified":"20260924T213308", "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":"Probability and Analysis Seminar: Tightness of and counterexamples to several quantum estimates", "occurrence_title":"", "combined_title":"Probability and Analysis Seminar: Tightness of and counterexamples to several quantum estimates: Alexander Volberg (MSU)", "event_subtitle":"Alexander Volberg (MSU)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: Recently the TCS query learning ala Nisan--Mansur--Linial got the boost from a harmonic analysis random algorithm. This problem has a non-commutative version where one needs to learn a very big matrix (so-called d-local hamiltonians) from a few random queries.\nThe corresponding harmonic analysis results have a drawback that it is still not known how tight they are. We will discuss this and show tightness for some of them. Interestingly, one such tightness result is closely related to Einstein--Podolsky--Rosen paradox from quantum mechanics. On a close issue: arguably the main problem in understanding the speed up of quantum algorithms versus classical ones for a certain collection of problems (called Aaronson--Ambainis conjecture and still open) will be discussed too if time permits.", "occurrence_notes":null, "guid":"152870-21914627@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152870", "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":21914627 } , "152931-21914811": { "datetime_modified":"20260928T124440", "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":"Student AIM Seminar: Internship Panel", "occurrence_title":"", "combined_title":"Student AIM Seminar: Internship Panel: Choco Li, Noah Conner, Zikang Jia, Stas Kowalski, Jasper Liang", "event_subtitle":"Choco Li, Noah Conner, Zikang Jia, Stas Kowalski, Jasper Liang", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Math\/AIM graduate students and alumni who have participated in internships or fellowships will share their experiences, discuss the application processes, and answer questions from the audience. This is a great opportunity especially for graduate student attendees to gain insight into securing internships and fellowships.\n\nPanelists: \n\nChoco Li (Flatiron Institute)\nNoah Conner (Lawrence Berkeley National Laboratory)\nZikang Jia (Morgan Stanley)\nStas Kowalski (Los Alamos National Laboratory)\nJasper Liang (Optiver)", "occurrence_notes":null, "guid":"152931-21914811@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152931", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Applied Mathematics","Career","Internships"], "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_152931_original-1.png", "styled_images":{ 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and Shinder: Igor Dolgachev (UM)", "event_subtitle":"Igor Dolgachev (UM)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBA", "occurrence_notes":null, "guid":"151938-21912488@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151938", "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":21912488 } , "148876-21905038": { "datetime_modified":"20260920T131702", "datetime_start":"20261002T150000", "datetime_end":"20261002T160000", "has_end_time":1, "date_start":"2026-10-02", "date_end":"2026-10-02", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"AIM Seminar: Math and physics at the moir\u00e9 scale", "occurrence_title":"", "combined_title":"AIM Seminar: Math and physics at the moir\u00e9 scale: Mitchell Luskin (Mathematics, University of Minnesota)", "event_subtitle":"Mitchell Luskin (Mathematics, University of Minnesota)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: Placing a two-dimensional lattice with a small rotation gives rise to almost periodic \"moir\u00e9\" patterns on a superlattice scale much larger than the original lattice. We have used the mathematical techniques developed to study waves in inhomogeneous media to identify a regime where the Bistritzer-MacDonald continuum model emerges as the effective dynamics for electrons modeled as wave-packets spectrally concentrated at the monolayer Dirac points of linear dispersion, up to error that we rigorously estimate. We have shown that this regime is realized in twisted bilayer graphene at the first \"magic\" angle where the group velocity of the wave packet is zero and strongly correlated electronic phases (superconductivity, Mott insulators, etc.) have recently been observed.\n\nWe will present recent results that rigorously extend this analysis to account for the effects of structural relaxation and to essentially arbitrary moir\u00e9 materials such as twisted multilayer transition metal dichalcogenides (TMDs) or even twisted heterostructures consisting of layers of distinct 2D materials.\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":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21905038 } , "149734-21907011": { "datetime_modified":"20260914T092752", "datetime_start":"20261002T150000", "datetime_end":"20261002T160000", "has_end_time":1, "date_start":"2026-10-02", "date_end":"2026-10-02", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Combinatorial invariance for the coefficient of q in Kazhdan-Lusztig polynomials", "occurrence_title":"", "combined_title":"Combinatorial invariance for the coefficient of q in Kazhdan-Lusztig polynomials: Christian Gaetz (UC Berkeley)", "event_subtitle":"Christian Gaetz (UC Berkeley)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"I will describe joint work with Grant Barkley and Thomas Lam in which we study the Combinatorial Invariance Conjecture (CIC), which asserts that Kazhdan-Lusztig polynomials depend only on the combinatorics of Bruhat order. Motivated by the cluster structure on Richardson varieties, we prove the combinatorial invariance of the coefficient of q in KL polynomials for arbitrary Coxeter groups. We also prove the Gabber-Joseph conjecture for the second-highest Ext group of a pair of Verma modules, as well as the combinatorial invariance of the dimension of this group.", "occurrence_notes":null, "guid":"149734-21907011@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149734", "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":21907011 } , "152758-21914471": { "datetime_modified":"20260923T140605", "datetime_start":"20261002T150000", "datetime_end":"20261002T160000", "has_end_time":1, "date_start":"2026-10-02", "date_end":"2026-10-02", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Stability conditions on product-quotient surfaces", "occurrence_title":"", "combined_title":"Stability conditions on product-quotient surfaces: Uttaran Dutta (University of South Carolina)", "event_subtitle":"Uttaran Dutta (University of South Carolina)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Product-quotient surfaces form an interesting class of surfaces of general type. We explore the stability manifold of these surfaces. In cases where the group action is not free, we construct non-geometric stability conditions.", "occurrence_notes":null, "guid":"152758-21914471@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152758", "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":21914471 } , "149808-21907215": { "datetime_modified":"20260926T094510", "datetime_start":"20261002T160000", "datetime_end":"20261002T170000", "has_end_time":1, "date_start":"2026-10-02", "date_end":"2026-10-02", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Topology seminar: Invariants from real Heegaard Floer homology", "occurrence_title":"", "combined_title":"Topology seminar: Invariants from real Heegaard Floer homology: Eha Srivastava (Stanford University)", "event_subtitle":"Eha Srivastava (Stanford University)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: Introduced by Guth and Manolescu, real Heegaard Floer homology is an invariant associated to 3-manifolds equipped with an involution. In this talk, we will see how under certain assumptions, the real Heegaard Floer homology groups admit an absolute Z\/2 grading. We then specialize to double branched covers of links in S^3, and the Euler characteristic in this case is the Heegaard Floer analogue of Miyazawa\u2019s degree invariant. Once the signs are fixed, we show that this quantity can be computed inductively using a skein relation. Furthermore, we show that it can be expressed in terms of the Alexander polynomial of the link.", "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 } , "153026-21914935": { "datetime_modified":"20260928T210311", "datetime_start":"20261005T150000", "datetime_end":"20261005T160000", "has_end_time":1, "date_start":"2026-10-05", "date_end":"2026-10-05", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Math Grad Show and Tell Seminar: The Limits of Axioms", "occurrence_title":"", "combined_title":"Math Grad Show and Tell Seminar: The Limits of Axioms: Zander Hill", "event_subtitle":"Zander Hill", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Has this ever happened to you? You're sitting down to prove a lemma, but none of your ideas seem to work out! At the same time, you've tried a number of counterexamples, but none of them seem to disprove your result! In this talk, we'll cover how this may not be your fault: there exist mathematical statements which can neither be proved or disproved from our system of axioms. We'll sketch a technique for proving these sorts of independence results with the classical example, the continuum hypothesis.", "occurrence_notes":null, "guid":"153026-21914935@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/153026", "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":"https:\/\/events.umich.edu\/media\/attachments\/2026\/09\/event_153026_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_thumb\/media\/attachments\/2026\/09\/event_153026_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/09\/event_153026_original-1.jpg", 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"occurrence_count":1, "first_occurrence":21914935 } , "152055-21912772": { "datetime_modified":"20260920T132844", "datetime_start":"20261005T160000", "datetime_end":"20261005T170000", "has_end_time":1, "date_start":"2026-10-05", "date_end":"2026-10-05", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"ISRMT Seminar: Title TBA", "occurrence_title":"", "combined_title":"ISRMT Seminar: Title TBA: Alexander Tovbis (University of Central Florida)", "event_subtitle":"Alexander Tovbis (University of Central Florida)", "event_type":"Presentation", "event_type_id":"16", "description":"Abstract: TBA", "occurrence_notes":null, "guid":"152055-21912772@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152055", "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":21912772 } , "152946-21914826": { "datetime_modified":"20260928T113827", "datetime_start":"20261005T160000", "datetime_end":"20261005T170000", "has_end_time":1, "date_start":"2026-10-05", "date_end":"2026-10-05", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"GLNT: No seminar---go to MNTD on 10\/3!", "occurrence_title":"", "combined_title":"GLNT: No seminar---go to MNTD on 10\/3!", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"None", "occurrence_notes":null, "guid":"152946-21914826@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152946", "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":21914826 } , "152889-21914688": { "datetime_modified":"20260925T134615", "datetime_start":"20261006T100000", "datetime_end":"20261006T110000", "has_end_time":1, "date_start":"2026-10-06", "date_end":"2026-10-06", "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. Scott Schneider will continue discussing his work on Borel equivalence relations generated by families of commuting functions.", "occurrence_notes":null, "guid":"152889-21914688@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/152889", "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":21914688 } , "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. G\u00fcrb\u00fczbalaban, Entropic risk-averse generalized momentum methods, Optimization Methods and Software, 2025. https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/10556788.2025.2549356", "occurrence_notes":null, "guid":"141373-21888712@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141373", "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":21888712 } , "151181-21911040": { "datetime_modified":"20260914T171857", "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":"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. Alexander Rodriguez (Umich)", "event_subtitle":"C. Alexander Rodriguez (Umich)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: The KPZ universality class is a broad collection of mathematical and physical models linked through their shared universal scaling behavior. A privileged subset, known as exactly solvable models, possess algebraic structure that allows for exact formulas for their probability distributions.\n\nFor an even smaller subset of these models, their distributions have been shown to satisfy nonlinear equations from classical integrable systems, including Painlev\u00e9, KP, and Toda equations. Why should equations from soliton theory appear in random growth, and why do they keep reappearing across different models?\n\nI will describe a framework that gives a common algebraic explanation and extends this connection to eighteen exactly solvable models. The framework organizes the Fredholm determinant formulas of solvable KPZ models into an overdetermined linear problem whose compatibility conditions reveal a discrete integrable structure gauge equivalent to the non-abelian Hirota\u2013Miwa equation.", "occurrence_notes":null, "guid":"151181-21911040@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151181", "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":21911040 } , "151942-21912491": { "datetime_modified":"20260910T181045", "datetime_start":"20261008T160000", "datetime_end":"20261008T170000", "has_end_time":1, "date_start":"2026-10-08", "date_end":"2026-10-08", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Preprint Algebraic Geometry seminar: Stability Conditions on Smooth Projective Varieties, after Chunyi Li", "occurrence_title":"", "combined_title":"Preprint Algebraic Geometry seminar: Stability Conditions on Smooth Projective Varieties, after Chunyi Li: Saket Shah (UM)", "event_subtitle":"Saket Shah (UM)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBA", "occurrence_notes":null, "guid":"151942-21912491@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151942", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":null, "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":21912491 } , "148877-21905039": { "datetime_modified":"20260920T131748", "datetime_start":"20261009T150000", "datetime_end":"20261009T160000", "has_end_time":1, "date_start":"2026-10-09", "date_end":"2026-10-09", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"AIM Seminar: Spectral theory of soliton gases for integrable equations and related problems", "occurrence_title":"", "combined_title":"AIM Seminar: Spectral theory of soliton gases for integrable equations and related problems: Alexander Tovbis (University of Central Florida)", "event_subtitle":"Alexander Tovbis (University of Central Florida)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: Soliton gases for integrable systems is a rapidly developing new area in the theory of nonlinear waves. The spectral theory of soliton gases is concerned about macroscopic characteristics of large soliton ensembles. We go briefly over the history of the subject, such as V. Zakharov\u2019s (1971) expression of the average velocity of a trial soliton in a (diluted) gas and the idea of the thermodynamic limit of wavenumbers and frequencies of finite gap solutions of G. El (2003). We then discuss some recent results and open problems, as well as some methods of potential theory and algebraic geometry that appear to be relevant for soliton gases.\n\nContact: Peter Miller", "occurrence_notes":null, "guid":"148877-21905039@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148877", "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":21905039 } , "149753-21907057": { "datetime_modified":"20260916T151809", "datetime_start":"20261009T150000", "datetime_end":"20261009T160000", "has_end_time":1, "date_start":"2026-10-09", "date_end":"2026-10-09", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Chow Vanishing and Motives of Cluster Varieties", "occurrence_title":"", "combined_title":"Chow Vanishing and Motives of Cluster Varieties: Josie Hlavinka (UC Berkeley)", "event_subtitle":"Josie Hlavinka (UC Berkeley)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Progress over the last decade has shown that the cohomologies of full rank, locally acyclic cluster varieties enjoy remarkable combinatorial structures. Crucial in this program has been the observation that these cohomology groups are, in certain Hodge theoretic senses, about as simple as possible. In this talk we will discuss a motivic lift of this observation. 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We propose\nan entropic variant of Korpelevich\u2019s extragradient algorithm\u2014the Kullback\u2013Leibler Mirror-Prox\nmethod\u2014in which Euclidean projections are replaced by relative-entropy proximal steps. Each\nhalf-step is therefore an explicit exponential reweighting of the current measure, implemented on a\nfinite state-space discretization. Under Lasry\u2013Lions monotonicity and continuity assumptions, we\nprove convergence of mesh-refined ergodic averages and obtain finite-iteration Minty-residual and\napproximate-equilibrium bounds that jointly quantify iteration and discretization errors. Under\nstrong monotonicity, we derive metric convergence rates for the last, best, and averaged iterates.\nWe also develop a KL-type Tikhonov regularization that selects the equilibrium minimizing relative\nentropy with respect to a reference measure. The framework applies to potential and nonpotential\ncost operators and does not require differentiability or convexity of the cost in the individual state.\n\nJoint work with Erhan Bayraktar, Ibrahim Ekren and Lu Vy.", "occurrence_notes":null, "guid":"150040-21907900@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150040", "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":"" }, 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These solutions are characterized by a Riemann-Hilbert problem which arises as the limit $N\\to \\infty$ of a sequence of $2N$-soliton RH problems, where the solitons display two different triangularity in the jumps. The limiting RH problem belongs to a novel class of problems, where the jump matrices do not have any zero entry (as opposed to the classical upper\/lower triangular setting).\n We show that the initial profile of such a gas solution is approaching a cnoidal wave solution for $x\\to \\pm \\infty$ with different phase shifts, and we establish an asymptotic description of the gas of solitons for large times that is valid over the entire spatial domain, in terms of Jacobi elliptic functions, with slowly modulated phase shifts as time varies from $-\\infty$ to $+\\infty$.\nThis is a joint work with Ken McLaughlin (Tulane U.) and Robert Jenkins (UCF).\n\n*To request access to the Zoom room, please contact Nathan Hayford at nhayford [ at ] umich.edu.*", "occurrence_notes":null, "guid":"153062-21915026@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/153062", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Virtual", "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":21915026 } , "148250-21903442": { "datetime_modified":"20260923T090325", "datetime_start":"20261027T160000", "datetime_end":"20261027T170000", "has_end_time":1, "date_start":"2026-10-27", "date_end":"2026-10-27", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Colloquium: How to achieve quantum advantage?", "occurrence_title":"", "combined_title":"Colloquium: How to achieve quantum advantage?: Lin Lin, Caltech", "event_subtitle":"Lin Lin, Caltech", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"The development of error-corrected quantum computers raises the prospect of quantum advantages in scientific computation. Which problems are likely to benefit, and what will it take to realize these advantages? I will first discuss basic quantum algorithm concepts and some criteria for comparing quantum and classical computation. I will then focus on eigenvalue problems, where improving the precision of an approximate solution offers one possible route to quantum advantage. Recent advances allow quantum eigensolvers to use few auxiliary qubits and short coherent evolutions, with near-optimal dependence on the target precision. I will introduce these developments and a method for estimating multiple eigenvalues together with their multiplicities. 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A substantial body of work has established theoretical foundations for classical reinforcement learning algorithms, including temporal-difference learning, policy iteration, and Q-learning. By contrast, policy gradient descent, despite its widespread use, remains less well understood from a theoretical perspective, largely because of its non-convex structure and the complexity of the underlying functional space. Existing convergence analyses typically require uniform regularity assumptions on the policy, viewed as a feedback control function, along the gradient flow; moreover, the resulting convergence rates depend on these regularity bounds. In this work, we significantly strengthen the existing convergence theory. Our key insight is to relate policy gradient descent to a mirror flow on the space of probability measures over controlled trajectories, where the Bregman divergence is induced by the convex control cost. We rigorously prove a JKO-type convergence result showing that the discrete-time mirror flow converges to its continuous-time counterpart, and we identify the limiting dynamics as a preconditioned policy gradient descent flow on the space of control processes. Leveraging this mirror-flow perspective, we establish an exponential convergence rate that is independent of policy regularity. 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In this talk, I will present our work on understanding and controlling collective behavior across theoretical and experimental systems. I will first discuss experimental work involving magnetic microrobot collectives in which competing pairwise interactions enable reconfiguration between distinct states, locomotion, and environmental interactions. And when heterogeneity and asymmetric interactions are introduced, they can be used to program self-organization and generate various collective behaviors that include phase separation, morphology changes, and object manipulation. 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