{ "151180-21911039": { "datetime_modified":"20260901T081333", "datetime_start":"20260909T160000", "datetime_end":"20260909T170000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Probability and Analysis Seminar: A Riemann-Hilbert approach to Dyson Brownian motion and Gaussian multiplicative chaos", "occurrence_title":"", "combined_title":"Probability and Analysis Seminar: A Riemann-Hilbert approach to Dyson Brownian motion and Gaussian multiplicative chaos: Nathan Hayford (Umich)", "event_subtitle":"Nathan Hayford (Umich)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Abstract: The connection between random matrices and Gaussian multiplicative chaos (GMC) has been studied intensively since the work of Fyodorov and Keating (2014). There has been recent interest in the appearance of GMC in dynamical ensembles of random matrices and their eigenvalues, such as the Dyson Brownian motion (Keles 2025). We propose a Riemann-Hilbert approach to this problem. I will explain how our approach allows one to probe the \u201cmicroscopic scale\u201d (a scale which is inaccessible via loop equations), where the appearance of Painlev\u00e9 transcendents is anticipated. This is joint work with Ahmad Barhoumi.", "occurrence_notes":null, "guid":"151180-21911039@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151180", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4088", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Probability and Analysis Seminar - Department of Mathematics", "group_id":"5203", "website":"https:\/\/sites.google.com\/view\/probsemumich\/future-talks" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21911039 } , "149581-21906722": { "datetime_modified":"20260803T153429", "datetime_start":"20260909T160000", "datetime_end":"20260909T170000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Stability, Approximation, and Robustness of Optimal Policies in POMDPs", "occurrence_title":"", "combined_title":"Stability, Approximation, and Robustness of Optimal Policies in POMDPs: Yunus Emre Demirci, UM", "event_subtitle":"Yunus Emre Demirci, UM", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"In this talk, I will focus on the stability, approximation, and robustness of optimal policies in partially observable Markov decision processes (POMDPs) under discounted and average cost criteria.\n\nI will begin with filter kernel perturbation under model change. I will establish how small perturbations in the transition or observation kernels lead to explicit, nonasymptotic bounds on both the filter kernel and the performance of the induced policies. A primary result demonstrates that an optimal policy computed under an incorrect model remains near optimal for the true model, with quantitatively bounded errors.\n\nBuilding on these stability concepts, I will then talk about the average cost setting and describe conditions under which the nonlinear filter exhibits a contraction property. Under these conditions, the vanishing discounted approach yields a solution to the average cost optimality equation, guaranteeing the existence of a stationary optimal policy. Furthermore, this provides explicit bounds that quantify the influence of initial prior distribution errors and model errors on long run performance.\n\nFinally, I will present results on implementable approximations. I will introduce refined error bounds for finite window controllers and conclude by discussing how Q learning can be utilized through either finite window or the quantization of the belief process to obtain near optimal policies for both discounted and average cost criteria.", "occurrence_notes":null, "guid":"149581-21906722@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149581", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1360", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Financial\/Actuarial Mathematics Seminar - Department of Mathematics", "group_id":"4890", "website":"" }, { "group_name":"Department of Mathematics", "group_id":"3791", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21906722 } , "149369-21906290": { "datetime_modified":"20260714T142604", "datetime_start":"20260909T160000", "datetime_end":"20260909T180000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"16:00:00", "time_end":"18:00:00", "time_zone":"America\/Detroit", "event_title":"The State and the Soldier: A History of Civil-Military Relations in the United States", "occurrence_title":"", "combined_title":"The State and the Soldier: A History of Civil-Military Relations in the United States: Kori Schake, American Enterprise Institute", "event_subtitle":"Kori Schake, American Enterprise Institute", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"America's Founding Fathers feared that a standing army would be a permanent political danger, yet the U.S. military has in the 250 years since become a bulwark of democracy. Kori Schake explains why in this compelling history of civil-military relations from independence to the challenges of the present. Can the United States\u2019 admirable record be sustained when the public is pulling the military into the political divisions of our time?\n \nWebinar Link: https:\/\/myumi.ch\/d8kN8\n\nIf there is anything we can do to make this event accessible to you, please contact us at emergingdemocracies@umich.edu. Please be aware that advance notice is necessary as some accommodations may require more time for the university to arrange.", "occurrence_notes":null, "guid":"149369-21906290@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149369", "building_id":"1000120", "building_name":"Michigan Union", "campus_maps_id":"191", "room":"Kuenzel Room", "location_name":"Michigan Union", "has_livestream":0, "cost":"", "tags":["Military","history"], "website":"", "sponsors":[ { "group_name":"Center for Emerging Democracies", "group_id":"3096", "website":"http:\/\/www.ii.umich.edu\/emergingdemocracies" }, { "group_name":"International Institute", "group_id":"1968", "website":"http:\/\/www.ii.umich.edu" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/07\/event_149369_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/07\/event_149369_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21906290 } , "149411-21906372": { "datetime_modified":"20260715T154457", "datetime_start":"20260909T160000", "datetime_end":"20260909T173000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"16:00:00", "time_end":"17:30:00", "time_zone":"America\/Detroit", "event_title":"WISE Welcome & Ice Cream Social Events", "occurrence_title":"WISE First-Year Student Welcome & Ice Cream Social", "combined_title":"WISE Welcome & Ice Cream Social Events: WISE First-Year Student Welcome & Ice Cream Social", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"What is Women in Science & Engineering? Get everything you need to know about WISE and connect with other STEM students at our Student Welcome & Ice Cream Social Events! We will have ice cream, popsicles and some fun giveaways at each of the four events:\n\nTuesday, 9\/8: Grad Student & Postdoc Welcome\nWednesday, 9\/9: First-Year Student Welcome \nThursday, 9\/10: Engineering Student Welcome\nFriday, 9\/11: All STEM Student Welcome\n\nEach of these events are designed to connect STEM students and are open to all. Please choose the event that best suits your needs and reach out to our team at umwise@umich.edu with any questions.", "occurrence_notes":null, "guid":"149411-21906372@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149411", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"WISE Office, 3236 Undergraduate Science Building", "has_livestream":0, "cost":"", "tags":["The College Of Literature, Science, And The Arts","Graduate and Professional Students","Women In Stem","Women In Science And Engineering","Welcome To Michigan","Undergraduate Students","Michigan Engineering","Sessions"], "website":"https:\/\/sessions.studentlife.umich.edu\/p\/track\/17421", "sponsors":[ { "group_name":"Sessions @ Michigan", "group_id":"4791", "website":"https:\/\/sessions.studentlife.umich.edu\/" }, { "group_name":"Women in Science and Engineering (WISE) Program", "group_id":"3737", "website":"http:\/\/wise.umich.edu" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/07\/event_149411_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_thumb\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_2x\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/07\/event_149411_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/07\/event_149411_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/07\/event_149411_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/07\/event_149411_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/07\/event_149411_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/07\/event_149411_original-1.png" }, "occurrence_count":4, "first_occurrence":21906371 } , "102102-21910754": { "datetime_modified":"20260903T022104", "datetime_start":"20260909T170000", "datetime_end":"20260909T190000", "has_end_time":1, "date_start":"2026-09-09", "date_end":"2026-09-09", "time_start":"17:00:00", "time_end":"19:00:00", "time_zone":"America\/Detroit", "event_title":"Maize & Blue Cupboard Volunteering", "occurrence_title":"MBC Operating Hours", "combined_title":"Maize & Blue Cupboard Volunteering: Multiple conference events and sessions: MBC Operating Hours", "event_subtitle":"Multiple conference events and sessions", "event_type":"Conference \/ Symposium", "event_type_id":"5", "description":"Come help us during normal operating hours; as well as, unload our weekly Food Gatherers deliveries and stock our shelves!\u00a0If you are outside the U-M community, please reach out to maize.blue.cupboard@umich.edu to sign up.", "occurrence_notes":null, "guid":"102102-21910754@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/102102", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"Maize and Blue Cupboard inside Betsy Barbour", "has_livestream":0, "cost":"", "tags":["Sessions"], "website":"https:\/\/sessions.studentlife.umich.edu\/p\/track\/3152", "sponsors":[ { "group_name":"Sessions @ Michigan", "group_id":"4791", "website":"https:\/\/sessions.studentlife.umich.edu\/" } ], "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":29, "first_occurrence":21910749 } }