{ "149657-21906898": { "datetime_modified":"20260922T115750", "datetime_start":"20260930T153000", "datetime_end":"20260930T165000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"15:30:00", "time_end":"16:50:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Seminar: Crepant resolutions via stacks", "occurrence_title":"", "combined_title":"Algebraic Geometry Seminar: Crepant resolutions via stacks: Jeremy Usatine, Florida State University", "event_subtitle":"Jeremy Usatine, Florida State University", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Consider an invariant that behaves nicely for smooth varieties, such as Euler number, Betti numbers, or Hodge numbers. Suppose we want a version of this invariant for singular varieties that sees interesting information about the singularities. I will discuss how this naturally leads to the notion of crepant resolutions of singularities. However, crepant resolutions (by varieties) are rare in practice. I will discuss joint work with M. Satriano in which we show that crepant resolutions actually exist in broad generality, as long as one is willing to consider algebraic stacks. Specifically, any variety with log-terminal singularities admits a crepant resolution by a smooth algebraic stack. As one consequence, in joint work with J. Huang and M. Satriano, we obtain a cohomological interpretation for Batyrev's stringy Hodge numbers. This talk will not assume familiarity with stacks.", "occurrence_notes":null, "guid":"149657-21906898@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149657", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"4096", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Algebraic Geometry Seminar - Department of Mathematics", "group_id":"4880", "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":21906898 } , "150650-21909759": { "datetime_modified":"20260924T111012", "datetime_start":"20260930T160000", "datetime_end":"20260930T170000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"CCMB\/DCMB Weekly Bioinformatics Seminar Series featuring Jianzhi Zhang, PhD (Professor, Ecology and Evolutionary Biology, U-M)", "occurrence_title":"", "combined_title":"CCMB\/DCMB Weekly Bioinformatics Seminar Series featuring Jianzhi Zhang, PhD (Professor, Ecology and Evolutionary Biology, U-M): \"Multi-environment fitness landscapes suggest effectively endless adaptation\"", "event_subtitle":"\"Multi-environment fitness landscapes suggest effectively endless adaptation\"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Jianzhi (George) Zhang is a Professor of Ecology and Evolutionary Biology interested in the relative roles of chance and necessity in evolution. He got his B. S. from Fudan University in Shanghai, China, and his Ph. D. in Genetics from Pennsylvania State University. He was a Fogarty postdoctoral fellow at the National Institute of Allergy and Infectious Diseases before moving to the University of Michigan.\n\nAbstract\n\nAdaptive evolution proceeds through beneficial nucleotide substitutions in the genome, yet the number of such substitutions (N) required to reach a local or global fitness peak where no single mutation further increases fitness remains unknown. Here we estimate N by simulating adaptive walks on two large, complete, multi-environment adaptive landscapes inferred from massive empirical data using machine learning, with validation from smaller experimentally mapped landscapes. We find that N rises linearly with the number of variable sites (L) in the landscape, regardless of prior adaptation in another environment. Extrapolation suggests a minimal N of 10^5 for typical prokaryotes and 10^7 for mammals. By contrast, in highly rugged shuffled landscapes, N is markedly reduced, while fitness gains also shrink. The relatively smooth empirical landscapes therefore enable greater fitness gains while lengthening adaptive walks, rendering even local fitness peaks effectively unreachable before environments change. These results explain the persistence of fitness gains in long-term evolution experiments and the widespread occurrence of beneficial mutations across species. They suggest that populations continuously adapt while remaining far from fitness optima, challenging the long-held view that adaptation culminates at fitness peaks.", "occurrence_notes":null, "guid":"150650-21909759@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/150650", "building_id":"1000190", "building_name":"Medical Science Unit I", "campus_maps_id":"104", "room":"4B700", "location_name":"Medical Science Unit I", "has_livestream":0, "cost":"", "tags":["Basic Science","Bioinformatics","Biology","Biosciences","Ecology","Genome"], "website":"https:\/\/medschool.umich.edu\/events\/ccmb-seminar-series\/ccmb-seminar-jianzhi-zhang-phd\/2026-09-30", "sponsors":[ { "group_name":"DCMB Seminar Series", "group_id":"3754", "website":"" }, { "group_name":"Department of Computational Medicine and Bioinformatics DCMB", "group_id":"5384", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/08\/event_150650_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_thumb\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_2x\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/08\/event_150650_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/08\/event_150650_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/08\/event_150650_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/08\/event_150650_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/08\/event_150650_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/08\/event_150650_original-1.png" }, "occurrence_count":1, "first_occurrence":21909759 } , "149970-21907457": { "datetime_modified":"20260926T202116", "datetime_start":"20260930T160000", "datetime_end":"20260930T180000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"16:00:00", "time_end":"18:00:00", "time_zone":"America\/Detroit", "event_title":"Distinguished University Professor Lectureship Series", "occurrence_title":"Distinguished University Professorship Lecture Series", "combined_title":"Distinguished University Professor Lectureship Series: Distinguished University Professorship Lecture Series", "event_subtitle":"", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Sponsored by the Office of the President and the Office of the Provost, this event features three Distinguished University Professors speaking on their professional and scholarly experiences. Each concise lecture will be followed by a brief Q & A.\u00a0\u201cThe 1857 Indian Revolution and the Rubaiyat of Omar Khayyam\u201d by Juan Cole (Richard P. Mitchell Distinguished University Professor of History and Professor of History, College of Literature, Science, and the Arts).\n\"Paying Attention\" by John Jonides (Edward E. Smith Distinguished University Professor of Psychology and Neuroscience, Co-Director, Magnetic Resonance Imaging Facility, Professor of Radiology, Medical School and Professor of Psychology, College of Literature, Science, and the Arts).\n\u201cStudying Aging and Dementia in Patients and Populations\u201d by Kenneth Langa (A. Regula Herzog Distinguished University Professor of Internal Medicine and Survey Research, Cyrus Sturgis Research Professor of Internal Medicine, Professor of Internal Medicine, Research Professor, Institute of Gerontology, Medical School, Research Professor, Survey Research Center, Institute for Social Research).\nNot able to attend in person? The event will be available via livestream here.", "occurrence_notes":null, "guid":"149970-21907457@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149970", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"Michigan League Ballroom", "has_livestream":0, "cost":"", "tags":["Sessions"], "website":"https:\/\/sessions.studentlife.umich.edu\/p\/track\/17435", "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":1, "first_occurrence":21907457 } , "149935-21907396": { "datetime_modified":"20260917T115242", "datetime_start":"20260930T160000", "datetime_end":"20260930T180000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"16:00:00", "time_end":"18:00:00", "time_zone":"America\/Detroit", "event_title":"Distinguished University Professorship Lecture Series", "occurrence_title":"", "combined_title":"Distinguished University Professorship Lecture Series", "event_subtitle":"", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Sponsored by the Office of the President and the Office of the Provost, this event features three Distinguished University Professors speaking on their professional and scholarly experiences. Each concise lecture will be followed by a brief Q & A.\n\n\u201cThe 1857 Indian Revolution and the Rubaiyat of Omar Khayyam\u201d by Juan Cole (Richard P. Mitchell Distinguished University Professor of History and Professor of History, College of Literature, Science, and the Arts).\n\n\"Paying Attention\" by John Jonides (Edward E. Smith Distinguished University Professor of Psychology and Neuroscience, Co-Director, Magnetic Resonance Imaging Facility, Professor of Radiology, Medical School and Professor of Psychology, College of Literature, Science, and the Arts).\n\n\u201cStudying Aging and Dementia in Patients and Populations\u201d by Kenneth Langa (A. Regula Herzog Distinguished University Professor of Internal Medicine and Survey Research, Cyrus Sturgis Research Professor of Internal Medicine, Professor of Internal Medicine, Research Professor, Institute of Gerontology, Medical School, Research Professor, Survey Research Center, Institute for Social Research).", "occurrence_notes":null, "guid":"149935-21907396@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/149935", "building_id":"1000191", "building_name":"Michigan League", "campus_maps_id":"108", "room":"League Ballroom | Second Floor", "location_name":"Michigan League", "has_livestream":0, "cost":"", "tags":["Reception","AEM Featured","dup","lecture"], "website":"https:\/\/www.youtube.com\/watch?v=Xpf3lmSnYZ0", "sponsors":[ { "group_name":"University and Development Events", "group_id":"3213", "website":"" }, { "group_name":"Department of History", "group_id":"3470", "website":"" }, { "group_name":"Department of Psychology", "group_id":"3615", "website":"http:\/\/www.lsa.umich.edu\/psych\/" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/08\/event_149935_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/08\/event_149935_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/08\/event_149935_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/08\/event_149935_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/08\/event_149935_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/08\/event_149935_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/08\/event_149935_original-1.png" }, "occurrence_count":1, "first_occurrence":21907396 } , "151752-21912119": { "datetime_modified":"20260908T151707", "datetime_start":"20260930T160000", "datetime_end":"20260930T170000", "has_end_time":1, "date_start":"2026-09-30", "date_end":"2026-09-30", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"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":"151752-21912119@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\/resolve\/group_thumb\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/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\/resolve\/event_grid_2x\/media\/attachments\/2026\/09\/event_151752_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/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 } }