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This new identity involves counts of spanning forests and is proved by use of potential-theoretic concepts on graphs. This generalizes further to a determinant identity for effective resistance matrices on an arbitrary finite graph. I will mention a connection to the ultra-log-concave version of Mason's conjecture, and a strengthening for the graphic case.\r\n\r\nThis is joint work with Farbod Shokrieh and Chenxi Wu. https:\/\/arxiv.org\/abs\/2411.11488", "occurrence_notes":null, "guid":"138702-21883638@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/138702", "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":"Combinatorics Seminar - Department of Mathematics", "group_id":"4885", "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":21883638 } , "137252-21879996": { "datetime_modified":"20251030T100053", "datetime_start":"20251031T150000", "datetime_end":"20251031T160000", "has_end_time":1, "date_start":"2025-10-31", "date_end":"2025-10-31", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar | Huge Operators in AdS\/CFT and Matrix Models", "occurrence_title":"", "combined_title":"HET Seminar | Huge Operators in AdS\/CFT and Matrix Models: Pedro Viera (Perimeter)", "event_subtitle":"Pedro Viera (Perimeter)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Tbd", "occurrence_notes":null, "guid":"137252-21879996@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/137252", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"340", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["High Energy Theory Seminar","Lecture","Physics","Science"], "website":"", "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics", "group_id":"4286", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "website":"" }, { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "website":"" }, { "group_name":"Leinweber Institute for Theoretical Physics High Energy Theory Seminars", "group_id":"4313", "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":21879996 } , "141168-21888277": { "datetime_modified":"20251027T003921", "datetime_start":"20251031T150000", "datetime_end":"20251031T160000", "has_end_time":1, "date_start":"2025-10-31", "date_end":"2025-10-31", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Singular Cohomology of Singular Hypersurfaces", "occurrence_title":"", "combined_title":"Singular Cohomology of Singular Hypersurfaces: Hyunsuk Kim", "event_subtitle":"Hyunsuk Kim", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"TBD", "occurrence_notes":null, "guid":"141168-21888277@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141168", "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":"Student Algebraic Geometry Seminar - 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Passionate about sustainability?--water conservation, AI, carbon neutrality, transportation, ANYTHING!--come chat with us, share your passion(s) and interests, all while helping contribute to a more sustainable University of Michigan! Not to mention: WE WILL BUY YOUR DRINK!\r\n\r\nFind us at: \r\nMaizes Cafe every Friday from 3-4p and Rooting for Change Cafe (3rd Floor Palmer Commons) every other Wednesday from 5-6p", "occurrence_notes":null, "guid":"138091-21881930@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/138091", "building_id":"1000191", "building_name":"Michigan League", "campus_maps_id":"108", "room":"Maizie's Cafe", "location_name":"Michigan League", "has_livestream":0, "cost":"", "tags":["Activism","Climate Change","Discussion","Food","food and the environment","Free","Free Food","Graduate and Professional Students","In Person","Social","Social Impact","Student Org","Sustainability","Talk","Undergraduate Students"], "website":"https:\/\/planetblue.umich.edu\/campus\/get-involved\/for-students\/student-orgs\/ssc", "sponsors":[ { "group_name":"Student Sustainability Coalition", "group_id":"4616", "website":"" }, { "group_name":"Student Life Sustainability", "group_id":"4678", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/09\/event_138091_original-3.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2025\/09\/crop-event_138091_original-3.png" }, "occurrence_count":37, "first_occurrence":21881923 } , "141083-21888115": { "datetime_modified":"20251024T102441", "datetime_start":"20251031T153000", "datetime_end":"20251031T163000", "has_end_time":1, "date_start":"2025-10-31", "date_end":"2025-10-31", "time_start":"15:30:00", "time_end":"16:30:00", "time_zone":"America\/Detroit", "event_title":"Smith Lecture: Emily Troyer", "occurrence_title":"", "combined_title":"Smith Lecture: Emily Troyer: Shedding light on the unseen: Evolutionary insights from the fish fossil record", "event_subtitle":"Shedding light on the unseen: Evolutionary insights from the fish fossil record", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"The fossil record offers unique insights into evolutionary patterns that cannot be inferred from living species alone. Fossils provide a critical temporal element to macroevolutionary studies, allowing us to strengthen phylogenetic inferences, document morphological change through time, and directly calibrate divergence events. My past research lies at the intersection of phylogeny, phenotype, and time, relying extensively on fossil specimens to detect patterns of morphological change over deep time. In one study, using tetraodontiform fishes (pufferfishes and relatives) as a model system, I combined phylogenomic data, paleoclimatic records, and body size measurements from living and fossil species to test long-standing macroevolutionary hypotheses of body size evolution. These analyses revealed that increasing body size correlates with cooling ocean temperatures through time, providing strong support for both Bergmann\u2019s and Cope\u2019s rules in marine fishes. In another study, I used 3D morphological data from exceptionally preserved fossil jaws of early bony fishes (423\u2013359 Ma) to uncover an adaptive radiation that was driven primarily by lungfishes and coelacanths, standing in contrast to their \u201cliving fossil\u201d descendants of today. 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