[ { "id":"143124-21892178", "datetime_modified":"20260304T174808", "datetime_start":"20260309T160000", "datetime_end":"20260309T170000", "has_end_time":1, "date_start":"2026-03-09", "date_end":"2026-03-09", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"An introduction to Dirac geometry and reduction schemes for concurrent Dirac structures.", "occurrence_title":"", "combined_title":"An introduction to Dirac geometry and reduction schemes for concurrent Dirac structures.: Alessandro Arsie (The University of Toledo)", "event_subtitle":"Alessandro Arsie (The University of Toledo)", "event_type":"Livestream \/ Virtual", "event_type_id":"24", "description":"I will provide first a gentle introduction to Dirac geometry, which is a way to unify pre-symplectic and Poisson geometry, as well as turning possibly singular Poisson structures into a perfectly smooth object. \n\nAfter this, I will consider a particular situation of transferring Dirac structures which is the following:\ngiven an embedded submanifold X of a Dirac manifold (M, L_M) and given p: X -> Y a smooth surjective submersion, we want to derive the minimal set of conditions to transfer the Dirac structure L_M on M to a Dirac structure L_Y on Y. These conditions are however not compatible with concurrence, which is a generalization for Dirac structures of the notion of commuting Poisson pairs. \n\nThen I will characterize a geometric structure, more precisely a vector bundle E\\subset TM|_X that is a \\emph{witness} for concurrence: it allows to transfer weakly concurrent Dirac structures on M to weakly concurrent Dirac structures on Y. We show that the Marsden-Ratiu reduction in Poisson geometry is exactly a special case of this construction. Furthermore, in the presence of a Hamiltonian action of a Lie group G on L_M, there is a natural candidate for a witness E. \n\nThe main results carry over to the case of complex Dirac structures. This allows us to give an extension of the bi-Hamiltonian reduction of Casati, Magri e Pedroni in terms of our framework and provide a (conjectural) interpretation of it in terms of complex Dirac structures. \n\nThis talk is based on a joint work with Dan Aguero, Pedro Frejlich and Igor Mencattini.", "occurrence_notes":null, "guid":"143124-21892178@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143124", "building_id":"", "building_name":"Off Campus Location", "building_official_id":null, "campus_maps_id":"1", "campus_maps_link_path":"", "campus_maps_link":"", "room":"", "location_name":"Virtual", "has_livestream":0, "cost":"", "tags":["Mathematics","Seminar","Virtual"], "website":"https:\/\/sites.google.com\/umich.edu\/isrmt-seminar\/", "links":[ { "type":"other", "url":"https:\/\/sites.google.com\/umich.edu\/isrmt-seminar\/", "title":"Seminar Webpage" } ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/143124\/qrcode.png", "occurrence_count":1, "first_occurrence":21892178 } , { "id":"143319-21892899", "datetime_modified":"20260301T210529", "datetime_start":"20260309T160000", "datetime_end":"20260309T170000", "has_end_time":1, "date_start":"2026-03-09", "date_end":"2026-03-09", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"GLNT: Eigenvarieties over CM fields and Galois representations", "occurrence_title":"", "combined_title":"GLNT: Eigenvarieties over CM fields and Galois representations: Vaughan McDonald (Stanford)", "event_subtitle":"Vaughan McDonald (Stanford)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Eigenvarieties are parameter spaces for certain p-adic automorphic forms of varying weight. These objects have become increasingly popular for studying the Fontaine\u2014Mazur conjecture, which leads us to ask what kinds of Galois representations appear on eigenvarieties. Our main result shows that for eigenvarieties for the group GL_n over a CM field, the associated Galois representations are trianguline at all p-adic places, resolving a conjecture of Hansen (following Kisin, Colmez, Bellaiche\u2014Chenevier). The strategy of proof (which could be of independent interest) is to embed eigenvarieties for GL_n into an eigenvariety for a 2n-variable unitary group.", "occurrence_notes":null, "guid":"143319-21892899@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143319", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/143319\/qrcode.png", "occurrence_count":1, "first_occurrence":21892899 } , { "id":"144156-21894748", "datetime_modified":"20260301T160025", "datetime_start":"20260310T160000", "datetime_end":"20260310T170000", "has_end_time":1, "date_start":"2026-03-10", "date_end":"2026-03-10", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Colloquium: From face numbers to Frobenius", "occurrence_title":"", "combined_title":"Colloquium: From face numbers to Frobenius: Eric Katz, Ohio State University", "event_subtitle":"Eric Katz, Ohio State University", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"In 1971, McMullen conjectured a characterization of the face numbers of convex simplicial polytopes. This conjecture, dubbed the \u201cg-conjecture\u201d, was resolved over the following ten years by work of Stanley and Billera\u2013Lee. The extension of this conjecture to simplicial spheres remained open much longer. We will discuss the ingenious characteristic 2 proof given by Papadakis\u2013Petrotou in 2020 and provide a unifying framework for it in commutative algebra. This is joint work in progress with Adiprasito, Papadakis, Petrotou, and Oba.", "occurrence_notes":null, "guid":"144156-21894748@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144156", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"https:\/\/people.math.osu.edu\/katz.60\/", "links":[ { "type":"other", "url":"https:\/\/people.math.osu.edu\/katz.60\/", "title":null } ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "image_description":"Eric Katz", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/02\/event_144156_original-2.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/02\/event_144156_original-2.jpg" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/144156\/qrcode.png", "occurrence_count":1, "first_occurrence":21894748 } , { "id":"146216-21898666", "datetime_modified":"20260305T022516", "datetime_start":"20260311T040000", "datetime_end":"20260311T050000", "has_end_time":1, "date_start":"2026-03-11", "date_end":"2026-03-11", "time_start":"04:00:00", "time_end":"05:00:00", "time_zone":"America\/Detroit", "event_title":"Probability\/Analysis Circle: What is the Toda Lattice?", "occurrence_title":"", "combined_title":"Probability\/Analysis Circle: What is the Toda Lattice?: Peter Miller", "event_subtitle":"Peter Miller", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"To briefly answer the question in the title, the Toda lattice is a system of particles connected with springs having an exponential force law. It turns out that the exponential force law is very special, allowing one to completely describe the dynamics of the system. In this talk, we will solve the Toda lattice explicitly in the case of two particles, and describe the long-term dynamics of the system by analyzing the solution. Then we will show how the method can be generalized so that any number of particles can be handled with similar precision. The general method involves a surprising connection with linear algebra.", "occurrence_notes":null, "guid":"146216-21898666@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/146216", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/146216\/qrcode.png", "occurrence_count":1, "first_occurrence":21898666 } , { "id":"143141-21892306", "datetime_modified":"20260304T203826", "datetime_start":"20260311T153000", "datetime_end":"20260311T165000", "has_end_time":1, "date_start":"2026-03-11", "date_end":"2026-03-11", "time_start":"15:30:00", "time_end":"16:50:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Seminar: Special valuations and automorphisms of affine log Calabi-Yau varieties", "occurrence_title":"", "combined_title":"Algebraic Geometry Seminar: Special valuations and automorphisms of affine log Calabi-Yau varieties: Yuchen Liu (Northwestern)", "event_subtitle":"Yuchen Liu (Northwestern)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"The notion of special valuations, i.e. finitely generated valuations inducing klt degenerations, plays an important role in the recent study of K-stability and moduli of Fano varieties. Given an affine log Calabi-Yau variety U, we show that its special skeleton, namely the space of special valuations in the dual complex of U, is independent of the choice of its Fano compactifications. Consequently, the special skeleton of U is invariant under the action of Aut(U). As an example, when U is the complement of a Markov cubic surface in the affine three-space, we show that the action of three Vieta involutions on the special skeleton exhibits a surprising connection with dynamics on the hyperbolic plane.", "occurrence_notes":null, "guid":"143141-21892306@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143141", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/143141\/qrcode.png", "occurrence_count":1, "first_occurrence":21892306 } , { "id":"138273-21882703", "datetime_modified":"20260226T132636", "datetime_start":"20260311T160000", "datetime_end":"20260311T170000", "has_end_time":1, "date_start":"2026-03-11", "date_end":"2026-03-11", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"2026 Ford Motor Company Distinguished Lecture in Physics | Organic Semiconductors \u2013 From OLED displays to new applications", "occurrence_title":"", "combined_title":"2026 Ford Motor Company Distinguished Lecture in Physics | Organic Semiconductors \u2013 From OLED displays to new applications: Richard Friend, Professor of Physics (Cavendish Laboratory, University of Cambridge)", "event_subtitle":"Richard Friend, Professor of Physics (Cavendish Laboratory, University of Cambridge)", "event_type":"Presentation", "event_type_id":"16", "description":"Lecture Abstract: Organic molecules with semiconducting properties are now used as the light-emitting diodes, LEDs, in organic LEDdisplays. These are now the dominant technologies for high-performance displays used in smartphones and televisions, but their potential applications are far broader, from solar cells to printable electronics to bio-interfaces. I will describe some of the journey from early discoveries to practical display technology, and outline some of our current research on the new phenomena these materials can exhibit, including their use as optically-accessed quantum sensors.\n\nFind out more about Professor Richard Friend by visiting our Ford Lecture event page at https:\/\/myumi.ch\/g35nR.\n\nThis lecture will be held in person and livestreamed: https:\/\/youtu.be\/P6lg1HTqkW8", "occurrence_notes":null, "guid":"138273-21882703@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/138273", "building_id":"1000172", "building_name":"Rackham Graduate School (Horace H.)", "building_official_id":1000172, "campus_maps_id":"71", "campus_maps_link_path":"horace-h-rackham-school-of-graduate-studies", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/horace-h-rackham-school-of-graduate-studies", "room":"Amphitheater, 4th Floor, Rackham Building", "location_name":"Rackham Graduate School (Horace H.)", "has_livestream":0, "cost":"", "tags":["AEM Featured","College Of Engineering","Faculty","Free","Graduate Students","Lecture","Lifelong Learning","Natural Sciences","Physics","seminar","Smoke-free","Undergrad Physics Events","Undergraduate Students"], "website":"https:\/\/lsa.umich.edu\/physics", "links":[ { "type":"other", "url":"https:\/\/lsa.umich.edu\/physics", "title":"Physics Department Website" } ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/08\/event_138273_original-1.png", "image_description":"Richard Friend, the 2026 Ford Lecture speaker profile photo.", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/08\/event_138273_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/08\/event_138273_original-1.png", 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"datetime_modified":"20260201T230754", "datetime_start":"20260311T160000", "datetime_end":"20260311T170000", "has_end_time":1, "date_start":"2026-03-11", "date_end":"2026-03-11", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Outperforming a Benchmark with $\\alpha$-Bregman Wasserstein divergence", "occurrence_title":"", "combined_title":"Outperforming a Benchmark with $\\alpha$-Bregman Wasserstein divergence: Silvana Pesenti, Toronto", "event_subtitle":"Silvana Pesenti, Toronto", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"We consider the problem of active portfolio management, where an investor seeks the portfolio with maximal expected utility of the difference between the terminal wealth of their strategy and a proportion of the benchmark's, subject to a budget, and a deviation constraint from the benchmark portfolio.\nAs the investor aims at outperforming the benchmark, they choose a divergence that asymmetrically penalises gains and losses as well as penalises underperforming the benchmark more than outperforming it. This is achieved by the recently introduced $\\alpha$-Bregman-Wasserstein divergence, subsuming the Bregman-Wasserstein and the popular Wasserstein divergence. We prove existence and uniqueness, characterise the optimal portfolio strategy, and give explicit criteria when the divergence constraints and the budget constraints are binding. We conclude with a numerical illustration of the optimal quantile function in a geometric Brownian motion market model.", "occurrence_notes":null, "guid":"138587-21883421@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/138587", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/138587\/qrcode.png", "occurrence_count":1, "first_occurrence":21883421 } , { "id":"145996-21898240", "datetime_modified":"20260226T132523", "datetime_start":"20260312T140000", "datetime_end":"20260312T160000", "has_end_time":1, "date_start":"2026-03-12", "date_end":"2026-03-12", "time_start":"14:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Bounding HSL Numbers: A Measure of the Nilpotency of Frobenius", "occurrence_title":"", "combined_title":"Bounding HSL Numbers: A Measure of the Nilpotency of Frobenius: Havi Ellers", "event_subtitle":"Havi Ellers", "event_type":"Presentation", "event_type_id":"16", "description":"Abstract: This thesis provides upper bounds for a certain singularity invariant, in the case where the underlying ring is in one of a few well-known classes of rings. The Hartshorne-Speiser-Lyubeznik number or HSL number of a Noetherian local (or graded) ring is a measure of the nilpotency of Frobenius on local cohomology with support at the (homogeneous) maximal ideal. It is known that the HSL number of such a ring is finite, but it is not known in general how to compute the HSL number for any given ring. In this thesis we present computable upper bounds for the HSL numbers of semigroup rings, toric face rings, and quotients of polynomial rings by monomial ideals, and compute the exact HSL number of monomial hypersurfaces. We also relate the HSL number of a ring to the HSL number of its reduction, provide Macaulay2 code to compute HSL numbers of quotients of polynomial rings, and discuss the application of our results to bounding Frobenius test exponents.", "occurrence_notes":null, "guid":"145996-21898240@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/145996", "building_id":"1000206", "building_name":"Angell Hall", "building_official_id":1000206, "campus_maps_id":"616", "campus_maps_link_path":"angell-hall-auditoriums", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/angell-hall-auditoriums", "room":"Auditorium B", "location_name":"Angell Hall", "has_livestream":1, "livestream_type":"zoom", "livetream_require_login":0, "livestream_id":"98025127294", "livestream_link":"https:\/\/umich.zoom.us\/j\/98025127294", "cost":"", "tags":["Dissertation","Graduate","Graduate Students","Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "image_description":"Math written in chalk on a chalk board.", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/02\/event_145996_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/02\/event_145996_original-1.jpg" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/145996\/qrcode.png", "occurrence_count":1, "first_occurrence":21898240 } , { "id":"143702-21893679", "datetime_modified":"20260112T103427", "datetime_start":"20260312T143000", "datetime_end":"20260312T163000", "has_end_time":1, "date_start":"2026-03-12", "date_end":"2026-03-12", "time_start":"14:30:00", "time_end":"16:30:00", "time_zone":"America\/Detroit", "event_title":"Student Real Analysis Reading Group", "occurrence_title":"", "combined_title":"Student Real Analysis Reading Group", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"The Student Real Analysis Reading Group facilitated by Siwei Wang will meet every Thursday from 2:30\u20134:30 PM in East Hall 5822 from Thursday, January 15 - 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The most general framework for such settings, the partially observable MDP, is statistically intractable. What structure makes learning tractable despite the latent variables?\n\nThis work identifies a common structural pattern across four distinct settings: the latent variable's influence is confined to one part of the data-generating process, and within that part it acts through a low-dimensional or low-complexity channel. We study this pattern in mixtures of MDPs, confounded offline policy evaluation, RLHF with partially observed reward states, and linear latent contextual bandits. In each case, we establish impossibility results showing what fails without the right assumptions, then develop algorithms that exploit the structure through spectral subspace recovery, decoupled estimation, and optimism calibrated to the latent channel's complexity. 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Nevertheless, constructing initial data for this family of matter models is surprisingly nuanced. In this talk we describe a novel approach to building Einstein-fluid initial data based on a recently established phase-space technique for constructing non-vacuum initial data sets. Compared to prior approaches to working with fluids, the input parameters allow for more direct specification of physical quantities, such as the number of particles in any given region.", "occurrence_notes":null, "guid":"143107-21892132@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143107", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Differential Equations Seminar - Department Of Mathematics","Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", 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This skeleton originates from mirror symmetry and captures geometrical and topological information of the Calabi--Yau. 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We support our findings with examples, and finally discuss avenues for future research.\n\nJoint work with Bryan Liang (Bloomberg), Marcel Nutz (Columbia), and Shunan Sheng (Columbia).", "occurrence_notes":null, "guid":"145064-21896609@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/145064", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/145064\/qrcode.png", "occurrence_count":1, "first_occurrence":21896609 } , { "id":"144458-21895384", "datetime_modified":"20260125T202826", "datetime_start":"20260319T154500", "datetime_end":"20260319T170000", "has_end_time":1, "date_start":"2026-03-19", "date_end":"2026-03-19", "time_start":"15:45:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Learning Seminar: Admissible resolutions", "occurrence_title":"", "combined_title":"Algebraic Geometry Learning Seminar: Admissible resolutions: Hyunsuk Kim", "event_subtitle":"Hyunsuk Kim", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Discuss the material in Section 4 of the paper. The main goals are to explain the statement of Theorem 3.15, to sketch the ideas in the proof, and to give some examples.", "occurrence_notes":null, "guid":"144458-21895384@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144458", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/144458\/qrcode.png", "occurrence_count":1, "first_occurrence":21895384 } , { "id":"141923-21889638", "datetime_modified":"20260305T084917", "datetime_start":"20260320T143000", "datetime_end":"20260320T153000", "has_end_time":1, "date_start":"2026-03-20", "date_end":"2026-03-20", "time_start":"14:30:00", "time_end":"15:30:00", "time_zone":"America\/Detroit", "event_title":"On Fox\u2019s trapezoidal conjecture (Combinatorics Seminar)", "occurrence_title":"", "combined_title":"On Fox\u2019s trapezoidal conjecture (Combinatorics Seminar): Karola M\u00e9sz\u00e1ros (Cornell)", "event_subtitle":"Karola M\u00e9sz\u00e1ros (Cornell)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Fox\u2019s trapezoidal conjecture from 1962 states that the absolute values of the coefficients of the Alexander polynomial of alternating links form a trapezoidal sequence. Stoimenow strengthened Fox\u2019s conjecture to log-concavity (without internal zeros) in 2005. Fox\u2019s conjecture remains open in general with special cases settled by Hartley (1979) for two-bridge knots, by Murasugi (1985) for a family of algebraic alternating links, and Ozsvath and Szabo (2003) for genus 2 alternating knots, among others. We will show how to prove Fox\u2019s conjecture for special alternating links by lifting the Alexander polynomials of these links to\"nice\u201d multivariate polynomials with 0,1 coefficients. The terms of the lift correspond to integer points of a generalized permutahedron, allowing for an application of the theory of Lorentzian polynomials developed by Branden and Huh (2019). This talk is based on joint works with Hafner and Vidinas.", "occurrence_notes":null, "guid":"141923-21889638@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141923", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"3866", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/141923\/qrcode.png", "occurrence_count":1, "first_occurrence":21889638 } , { "id":"141901-21889616", "datetime_modified":"20260304T095200", "datetime_start":"20260320T150000", "datetime_end":"20260320T160000", "has_end_time":1, "date_start":"2026-03-20", "date_end":"2026-03-20", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"AIM Seminar: Particle Mechanics Applications to Hazards in Civil Engineering", "occurrence_title":"", "combined_title":"AIM Seminar: Particle Mechanics Applications to Hazards in Civil Engineering: Est\u00e9fan Garcia (University of Michigan)", "event_subtitle":"Est\u00e9fan Garcia (University of Michigan)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: Many of the natural hazards that threaten infrastructure and communities are driven by particulate interactions and particle kinematics. Land surface hazards like landslides and earthquake surface rupture occur in particulate systems of sands and rocks. Coastal scour and erosion occur one grain of sand at a time. Even wildfire spread into communities at the wildland urban interface occurs through the wind-driven flow of millions of discrete firebrand particles. This presentation will showcase how our research group represents various hazards as fundamentally discontinuous particulate systems using the discrete element method (DEM). DEM uses relatively simple contact physics to model how discrete particles interact and the motions of these particles resulting from their interactions. With the aid of modern high-performance computing systems, we model discontinuous systems composed of millions of discrete particles, including particles of irregular shape and size to elucidate how these factors affect the macroscopic properties traditionally used to characterize material behaviors in constitutive models. Our simulations show how with simple boundary conditions, we can replicate complex mechanics of landslide runout, shear rupture propagation through soil, and firebrand accumulation in simulations validated not only on laboratory experiments but also on observed case histories. Our virtual experiments advance the understanding of natural hazards in a broad range of fields including civil engineering, mechanics, geology, and seismology. \n\nContact: Silas Alben", "occurrence_notes":null, "guid":"141901-21889616@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141901", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"1084", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/141901\/qrcode.png", "occurrence_count":1, "first_occurrence":21889616 } , { "id":"143322-21892901", "datetime_modified":"20260205T131919", "datetime_start":"20260323T160000", "datetime_end":"20260323T170000", "has_end_time":1, "date_start":"2026-03-23", "date_end":"2026-03-23", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"GLNT: TBA", "occurrence_title":"", "combined_title":"GLNT: TBA: Kenz Kallal (Princeton)", "event_subtitle":"Kenz Kallal (Princeton)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: TBA", "occurrence_notes":null, "guid":"143322-21892901@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143322", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/143322\/qrcode.png", "occurrence_count":1, "first_occurrence":21892901 } , { "id":"141892-21889604", "datetime_modified":"20260301T160351", "datetime_start":"20260324T160000", "datetime_end":"20260324T170000", "has_end_time":1, "date_start":"2026-03-24", "date_end":"2026-03-24", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Colloquium: Homological stability of moduli spaces", "occurrence_title":"", "combined_title":"Colloquium: Homological stability of moduli spaces: Dan Petersen, Stockholm University", "event_subtitle":"Dan Petersen, Stockholm University", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Homological stability has emerged over the past decades as an organizing principle in topology and beyond. Broadly speaking, many sequences of moduli spaces exhibit the striking phenomenon that their homology stabilizes as the underlying complexity grows. One of the most remarkable achievements of this paradigm is the proof of the Mumford conjecture by Madsen and Weiss, which identifies the stable rational cohomology of the moduli space of algebraic curves. This resolves a question of central importance in algebraic geometry and geometric group theory; all existing proofs use significant amounts of homotopy theory. In this lecture I will survey some ideas behind homological stability and the ubiquity of stability phenomena, and discuss consequences and applications, particularly in algebraic geometry and number theory.", "occurrence_notes":null, "guid":"141892-21889604@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141892", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"https:\/\/sites.google.com\/site\/danpetersenmath\/", "links":[ { "type":"other", "url":"https:\/\/sites.google.com\/site\/danpetersenmath\/", "title":null } ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "image_description":"Dan Petersen", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2025\/11\/event_141892_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2025\/11\/event_141892_original-1.jpg" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/141892\/qrcode.png", "occurrence_count":1, "first_occurrence":21889604 } , { "id":"141934-21889651", "datetime_modified":"20260228T101529", "datetime_start":"20260325T153000", "datetime_end":"20260325T165000", "has_end_time":1, "date_start":"2026-03-25", "date_end":"2026-03-25", "time_start":"15:30:00", "time_end":"16:50:00", "time_zone":"America\/Detroit", "event_title":"Michigan Lectures in Algebraic Geometry and Topology: Stable homology of moduli spaces and moments in families of L-functions over function fields", "occurrence_title":"", "combined_title":"Michigan Lectures in Algebraic Geometry and Topology: Stable homology of moduli spaces and moments in families of L-functions over function fields: Dan Petersen (Stockholm U.)", "event_subtitle":"Dan Petersen (Stockholm U.)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"In recent years, several problems in arithmetic statistics that seem completely intractable over number fields, have been resolved in the case of function fields by geometric methods; more specifically, by casting the problem in terms of the homology of a suitable moduli space of algebraic curves, and understanding the homology asymptotically. Perhaps the most notable is the work of Ellenberg-Venkatesh-Westerland and Landesman-Levy on Cohen-Lenstra heuristics. \n\nI will talk about joint work with Bergstr\u00f6m-Diaconu-Westerland and Miller-Patzt-Randal-Williams, where this paradigm is applied to another problem in analytic number theory. There is a \"recipe\" due to Conrey-Farmer-Keating-Rubinstein-Snaith (CFKRS) which allows for precise predictions for the asymptotics of moments of many different families of L-functions. We consider the family of all L-functions attached to hyperelliptic curves over some fixed finite field, in which case we are able to prove the CFKRS predictions for all moments, for all sufficiently large (but fixed) q.\nWe do this by studying the homology of the moduli space of hyperelliptic curves, with symplectic coefficients: we compute the stable homology groups, together with their structure as Galois representations, and prove a novel homological stability theorem in this setting. The proofs use homotopical ideas developed in connection with the Mumford conjecture, Borel's work on stable real cohomology of arithmetic groups, logarithmic algebraic geometry, and cellular E_k-algebras.", "occurrence_notes":null, "guid":"141934-21889651@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141934", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics","seminar"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/141934\/qrcode.png", "occurrence_count":1, "first_occurrence":21889651 } , { "id":"138042-21881387", "datetime_modified":"20260224T133411", "datetime_start":"20260325T160000", "datetime_end":"20260325T170000", "has_end_time":1, "date_start":"2026-03-25", "date_end":"2026-03-25", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Mean\u2013Variance Portfolio Selection by Continuous-Time Reinforcement Learning: Algorithms, Regret Analysis, and Empirical Study", "occurrence_title":"", "combined_title":"Mean\u2013Variance Portfolio Selection by Continuous-Time Reinforcement Learning: Algorithms, Regret Analysis, and Empirical Study: Xunyu Zhou, Columbia University", "event_subtitle":"Xunyu Zhou, Columbia University", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"We study continuous-time mean\u2013variance portfolio selection in markets where stock prices are diffusion processes driven by observable factors that are also diffusion processes, yet the coefficients of these processes are unknown. Based on the recently developed reinforcement learning (RL) theory for diffusion processes, we present a general data-driven RL algorithm that learns the pre-committed investment strategy directly without attempting to learn or estimate the market coefficients. For multi-stock Black\u2013Scholes markets without factors, we further devise a baseline algorithm and prove its performance guarantee by deriving a sublinear regret bound in terms of the Sharpe ratio. We then carry out an extensive empirical study implementing this algorithm to compare its performance and trading outcomes, evaluated under a host of common metrics, with a large number of widely employed portfolio allocation strategies on S&P 500 constituents. The results demonstrate that the proposed continuous-time RL strategy is consistently among the best, especially in a volatile bear market, and decisively outperforms the model-based continuous-time counterparts by significant margins. Joint work with Yilie Huang and Yanwei Jia.", "occurrence_notes":null, "guid":"138042-21881387@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/138042", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "links":[ ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/138042\/qrcode.png", "occurrence_count":1, "first_occurrence":21881387 } , { "id":"143702-21893680", "datetime_modified":"20260112T103427", "datetime_start":"20260326T143000", "datetime_end":"20260326T163000", "has_end_time":1, "date_start":"2026-03-26", "date_end":"2026-03-26", "time_start":"14:30:00", "time_end":"16:30:00", "time_zone":"America\/Detroit", "event_title":"Student Real Analysis Reading Group", "occurrence_title":"", "combined_title":"Student Real Analysis Reading Group", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"The Student Real Analysis Reading Group facilitated by Siwei Wang will meet every Thursday from 2:30\u20134:30 PM in East Hall 5822 from Thursday, January 15 - April 16, 2026.", "occurrence_notes":null, "guid":"143702-21893680@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143702", "building_id":"1000166", "building_name":"East Hall", "building_official_id":1000166, "campus_maps_id":"53", "campus_maps_link_path":"east-hall", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/east-hall", "room":"5822", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics","Undergraduate Students"], "website":"https:\/\/lsa.umich.edu\/math", "links":[ { "type":"other", "url":"https:\/\/lsa.umich.edu\/math", "title":"U-M Math Website" } ], "sponsors":[ { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "image_description":"", "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":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/143702\/qrcode.png", "occurrence_count":7, "first_occurrence":21893675 } , { "id":"141935-21889652", "datetime_modified":"20260228T101635", "datetime_start":"20260326T153000", "datetime_end":"20260326T165000", "has_end_time":1, "date_start":"2026-03-26", "date_end":"2026-03-26", "time_start":"15:30:00", "time_end":"16:50:00", "time_zone":"America\/Detroit", "event_title":"Michigan Lectures in Algebraic Geometry and Topology: Stable homology of moduli spaces and moments in families of L-functions over function fields", "occurrence_title":"", "combined_title":"Michigan Lectures in Algebraic Geometry and Topology: Stable homology of moduli spaces and moments in families of L-functions over function fields: Dan Petersen (Stockholm U.)", "event_subtitle":"Dan Petersen (Stockholm U.)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"In recent years, several problems in arithmetic statistics that seem completely intractable over number fields, have been resolved in the case of function fields by geometric methods; more specifically, by casting the problem in terms of the homology of a suitable moduli space of algebraic curves, and understanding the homology asymptotically. 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There, we uncover how a cooling Earth overcame major energy crises by switching its fuel source, thereby sustaining the magnetic shield that protects life.\n\nProfessor Ralf J. Spatzier\nGopal Prasad Collegiate Professor of Mathematics\n\nLecture Title: Symmetry In Geometry and Dynamics:\nThe Role of Intuition in Mathematics Research\n\nLecture Abstract: How does mathematics progress? And how do\nmathematicians actually make progress?\nWe are actually making lots of progress, and I hope I can\nconvince you! But there are many ways we achieve this. Let\nme tell you about it in my own case.\nLeading Question: How do I make progress?\n1: By working hard long hours in my office with my computer?\n2: By doing difficult calculations with pen and paper?\n3: By going for a walk?\nI will try to illuminate how fundamental progress happened in my\nown limited experience. It involved grand ideas such as\n\u201csymmetry\u201d and how it limits possibilities. A classical example\nare the Platonic solids, i.e. convex regular polyhedra with\ncongruent faces (symmetry). Turns out there are only five.\nWhen a few mild harmless assumptions greatly limit the possible\nobjects and even completely determine a system, we speak of\n\u201cRIGIDITY\u201d, just as in the case of the platonic solids.\nIn my own research, symmetry is an overriding principle, leading\nto rigidity in geometry. As it happened - and after many walks -\nthis also inspired ideas for rigidity in dynamical systems with\nsymmetry.\nSymmetry and extremal properties have played a major role in\nmathematics for a long time. While I will start to discuss this in\n\nthe context of some Riemannian geometry, I will emphasize more\nrecent work on dynamical systems. Here symmetry expresses\nitself in terms of having non-trivially commuting maps or flows,\nor an action of some group with complicated relations. Case in\npoint are actions of semisimple Lie groups, especially ones of\nhigher rank, e.g. SL(n,R) with n at least 3. This is the so-called\nZimmer program. I will hint at some recent highlights.\n\nProfessor Nicholas A. Valentino\nDonald R. Kinder Collegiate Professor of Political Science\n\nLecture Title: TBD\n\nLecture Abstract: TBD\n\nIf you are unable to join us in person, please click the link below to join the webinar.\nJoin from PC, Mac, iPad, or Android:\nhttps:\/\/umich.zoom.us\/j\/95783933422\n\nPhone one-tap:\n+13092053325,,95783933422# US\n+13126266799,,95783933422# US (Chicago)\n\nJoin via audio:\n+1 309 205 3325 US\n+1 312 626 6799 US (Chicago)\n+1 646 876 9923 US (New York)\n+1 646 931 3860 US\n+1 301 715 8592 US (Washington DC)\n+1 305 224 1968 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+1 689 278 1000 US\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: 957 8393 3422\nInternational numbers 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