{ "150012-21907810": { "datetime_modified":"20260807T155844", "datetime_start":"20261104T160000", "datetime_end":"20261104T170000", "has_end_time":1, "date_start":"2026-11-04", "date_end":"2026-11-04", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Exploratory Optimal Reinsurance under the Mean-Variance Criterion", "occurrence_title":"", "combined_title":"Exploratory Optimal Reinsurance under the Mean-Variance Criterion: Austin Riis-Due, Waterloo", "event_subtitle":"Austin Riis-Due, Waterloo", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"This paper proposes a Reinforcement Learning (RL) approach to the optimal reinsurance problem\nwhen the insurer faces uncertainty about the insurance claim dynamics. To this end, we first formulate\nan exploratory version of the problem as a relaxed stochastic control problem. Within a broad class of\nparametric retention functions and general risk loading functions, we derive the closed-form equilibrium\npolicy under the continuous-time mean-variance criterion. This is achieved through a formal verification\ntheorem and solving classical solutions of a system of exploratory extended Hamilton-Jacobi-Bellman\n(EEHJB) equations. We then establish a policy iteration theorem, showing that starting from any timeand state-homogeneous policy, policy iteration converges to the derived equilibrium policy. Next, we\ndevelop a martingale orthogonality theorem, which serves as the foundation of our RL algorithm. The\nalgorithm is evaluated through simulation studies and real data from the U.S. National Flood Insurance\nProgram. Results demonstrate that the RL approach effectively learns unknown claim distributions,\ntracks unobserved changes in claim dynamics and produces higher insurer surplus trajectories than the\nmaximum likelihood estimation (MLE) approach while simultaneously exhibiting greater robustness to\nthe choice of training window.", "occurrence_notes":null, "guid":"150012-21907810@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150012", "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":21907810 } , "151752-21912124": { "datetime_modified":"20260908T151707", "datetime_start":"20261104T160000", "datetime_end":"20261104T170000", "has_end_time":1, "date_start":"2026-11-04", "date_end":"2026-11-04", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"German Convo on the Go", "occurrence_title":"", "combined_title":"German Convo on the Go", "event_subtitle":"", "event_type":"Social \/ Informal Gathering", "event_type_id":"19", "description":"Meet at Burton Tower for a 1-hour walk and talk in German with Mary Gell (magell@umich.edu). This event happens 'rain or shine.' Open to speakers of German at all levels.", "occurrence_notes":null, "guid":"151752-21912124@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/151752", "building_id":"1000155", "building_name":"Burton Memorial Tower", "campus_maps_id":"25", "room":"Meet Outside the Tower", "location_name":"Burton Memorial Tower", "has_livestream":0, "cost":"", "tags":["European","German","German Studies","Germanic Languages And Literatures","Humanities","Language"], "website":"", "sponsors":[ { "group_name":"Germanic Languages & Literatures", "group_id":"3621", "website":"http:\/\/www.facebook.com\/umichGerman\/" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/09\/event_151752_original-1.jpg" }, "occurrence_count":13, "first_occurrence":21912116 } , "153824-21916401": { "datetime_modified":"20261019T120947", "datetime_start":"20261104T160000", "datetime_end":"20261104T170000", "has_end_time":1, "date_start":"2026-11-04", "date_end":"2026-11-04", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Hacking College Life With Chronic Illness and\/or Disability", "occurrence_title":"", "combined_title":"Hacking College Life With Chronic Illness and\/or Disability: Beth Kinney (Engineering CARE Center) and Marsha Benz (Wolverine Wellness)", "event_subtitle":"Beth Kinney (Engineering CARE Center) and Marsha Benz (Wolverine Wellness)", "event_type":"Well-being", "event_type_id":"12", "description":"Our 6-week wellness coaching group is a supportive space for U-M students with disabilities or chronic health conditions. It\u2019s a chance to connect with others, share experiences, and support one another. \n\nDates\/times: We will meet on Wednesdays from 4-5 p.m. on Zoom.\n\nWe will cover the following topics:\n\nSession 1: November 4 \u2014 Intros, Agreements, Ground Rules, and Definitions\nSession 2: November 11 \u2014 Boundaries and Values\nSession 3: November 18 \u2014 Addressing Worry\nNOTE: No group on Wednesday, November 25, due to proximity to Thanksgiving\nSession 4: December 2 \u2014 Self-Compassion Mindset\nSession 5: December 9 \u2014 Time Management\nSession 6: December 16 \u2014 Wrap Up, Review, and Optional Future Connections \nPlease note: the group can decide whether to wrap up a week earlier, given the end of the semester.\nLocation: Zoom; link sent upon completion of online intake\/screening. \n\nSign up: Register through our online scheduler. Please select \u201cGroup Coaching\u201d when selecting your coaching type, and you will be shown the calendar for current groups. Just sign up for the first session. If you attend, we will add you to future sessions. No additional participants will be added after the first session.", "occurrence_notes":"Link will be provided upon registration.", "guid":"153824-21916401@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/153824", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Virtual", "has_livestream":0, "cost":"", "tags":["Wellness Coaching","Public Health","Social Justice","Student Life","Well-being","Wellness","Diversity Equity and Inclusion","Wolverine Wellness","Health & Wellness","Disability","Community Building"], "website":"https:\/\/umich.impactfeedback.com\/surveystart\/surv_26082719OOXK8BGF6LKVM8\/WC%20Intake%20Survey%202026-2027\/", "sponsors":[ { "group_name":"Wolverine Wellness", "group_id":"1077", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/10\/event_153824_original-1.png", "styled_images":{ 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Suppose that L has the property that the determinant of every non-zero sublattice L' of L is larger than one. We prove that there exists a symmetric random vector X on R^n with a smooth, strictly positive density f on R^n simultaneously enjoying the following two properties: a) f is strongly log-concave; b) X + L is uniform on R^n\/L.\n\nMoreover, the existence of such a density f on R^n characterizes this determinant condition imposed on L. This construction connects several problems in lattice theory to established results in convex geometry. We discuss a range of applications. This is joint work with Victor Reis and Thomas Rothvoss.", "occurrence_notes":null, "guid":"153726-21916243@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/153726", "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:\/\/sites.google.com\/view\/probsemumich\/future-talks", "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":21916243 } , "149233-21906024": { "datetime_modified":"20261030T151510", "datetime_start":"20261104T160000", "datetime_end":"20261104T172000", "has_end_time":1, "date_start":"2026-11-04", "date_end":"2026-11-04", "time_start":"16:00:00", "time_end":"17:20:00", "time_zone":"America\/Detroit", "event_title":"RTG SEMINAR Topology, Geometry, Dynamics: Dense subgroups of compact groups: two vignettes.", "occurrence_title":"", "combined_title":"RTG SEMINAR Topology, Geometry, Dynamics: Dense subgroups of compact groups: two vignettes.: David Fisher (Rice)", "event_subtitle":"David Fisher (Rice)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"I will talk about two loosely related results about\ndense subgroups of compact groups, one with Sven Sandfeldt,\nthe other with Michael Larsen. The first concerns local rigidity\nof group actions, the second spectral gaps. I hope to explain\nsome questions that arise in this context and invite people\nto think about them.", "occurrence_notes":null, "guid":"149233-21906024@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149233", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"3860", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"RTG Seminar on Geometry, Dynamics and Topology - Department of Mathematics", "group_id":"4900", "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":21906024 } , "154402-21917657": { "datetime_modified":"20261101T234129", "datetime_start":"20261104T160000", "datetime_end":"20261104T170000", "has_end_time":1, "date_start":"2026-11-04", "date_end":"2026-11-04", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Student AIM Seminar: Instrument-Aware Diffusion for Solar Magnetogram Reconstruction", "occurrence_title":"", "combined_title":"Student AIM Seminar: Instrument-Aware Diffusion for Solar Magnetogram Reconstruction: Ian Augsburger", "event_subtitle":"Ian Augsburger", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Historical scientific archives often contain observations of lasting value that were acquired with lower-resolution instruments than those available today. Solar magnetograms provide a motivating example: the Michelson Doppler Imager (MDI) aboard the Solar and Heliospheric Observatory (SOHO) recorded decades of solar activity before the higher-resolution Helioseismic and Magnetic Imager (HMI) became available. We develop a generative framework that first learns how modern observations are transformed by an older instrument, uses this transformation to construct paired training data, and then trains a conditional diffusion model to reverse the loss of resolution. A scalable multiscale U-Net and DPM++ sampler generate multiple modern-quality reconstructions from each historical observation. 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