{ "143076-21892022": { "datetime_modified":"20260114T152620", "datetime_start":"20260121T153000", "datetime_end":"20260121T170000", "has_end_time":1, "date_start":"2026-01-21", "date_end":"2026-01-21", "time_start":"15:30:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Algebraic Geometry Seminar: D-affinity of flag varieties in positive characteristic", "occurrence_title":"", "combined_title":"Algebraic Geometry Seminar: D-affinity of flag varieties in positive characteristic: Feliks Raczka (IAS)", "event_subtitle":"Feliks Raczka (IAS)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"A smooth projective variety X is called D-affine if every left D-module is globally generated over D (the sheaf of differential operators) and has vanishing higher cohomology. A well known result of Beilinson-Bernstein asserts that over the field of complex numbers flag varieties of semi-simple algebraic groups are D-affine. So far, Flag varieties are the only known examples of smooth projective D-affine varieties. Moreover, Kashiwara-Lauritzen showed that over fields of positive characteristic the grassmannian Gr(2,5) is not D-affine and the classification of D-affine flag varieties remains an open problem.\r\n\r\nIn the first part of the talk, I will briefly recall the basics of D-affine varieties. Then, I will survey both the problem of classification of D-affine varieties over fields of arbitrary characteristic and the problem of classification of D-affine flag varieties in positive characteristic. Finally, I will present my recent result: Over a field of positive characteristic the smooth even-dimensional quadric hypersurface of dimension at least four is not D-affine. This result implies that various other flag varieties fail to be D-affine and refines a previous result of A. Langer who showed that odd-dimensional quadrics are D-affine if the characteristic of the base field is sufficiently large.", "occurrence_notes":null, "guid":"143076-21892022@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143076", "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":21892022 } , "142562-21891156": { "datetime_modified":"20260119T234520", "datetime_start":"20260121T160000", "datetime_end":"20260121T173000", "has_end_time":1, "date_start":"2026-01-21", "date_end":"2026-01-21", "time_start":"16:00:00", "time_end":"17:30:00", "time_zone":"America\/Detroit", "event_title":"CAS Book Talk. Between Armenian(s): A Conversation with Arakel Minassian", "occurrence_title":"", "combined_title":"CAS Book Talk. Between Armenian(s): A Conversation with Arakel Minassian: Arakel Minassian (U-M) and Michael Pifer (U-M)", "event_subtitle":"Arakel Minassian (U-M) and Michael Pifer (U-M)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Please join us for the re-launch of our graduate student Arakel Minassian\u2019s co-written book *Sahmanakhagh(kht): Hayerenn u hayer\u0113n\u011b [Border-play: The Armenian and the Armenian]*. In this book, Arakel and Armenia-based writer Anahit Ghazaryan narrate a moment in time that found Arakel navigating life in Armenia as a Lebanese-Armenian diasporan from Canada. Written as a set of correspondences between Arakel and Anahit on topics ranging from everyday interactions to specific musings on language and dialect, the book also narrates a meeting between the two major standards of Armenian \u2013 Arakel\u2019s Western Armenian, the standard of much of the post-genocide Armenian diaspora, and Anahit\u2019s Eastern Armenian, the standard of the post-Soviet Armenian Republic. Written in their respective dialects (and their different orthographies), Anahit and Arakel\u2019s dialogue illustrates the growing and complicated interactions between these two standards at the same time as it stages a discussion on diaspora, home, and the various meanings of Armenianness in the present-day. First published in Yerevan in 2022 with a grant from the Calouste Gulbenkian Foundation, *Sahmanakhagh(kht)* is now in its second printing. This event will feature a discussion with Arakel Minassian in English, as well as readings in both Armenian and English translation. Books will be available for purchase.\r\n \r\n Arakel Minassian is a PhD student in the University of Michigan\u2019s Department of Comparative Literature. His research focuses on 20th century Armenian literature and how writers creatively and differently engage Armenian and non-Armenian traditions across locales as diverse as Istanbul, Paris, and Soviet Yerevan. Looking at nodes like multilingualism, diaspora, and world literature, he tries to find novel ways of reading 20th century Armenian literary history. Arakel has also published several translations from Armenian, including Zabel Yesayan\u2019s 1918 book *The Agony of a People *and Yeghishe Charents\u2019 1920 poem *Vision of Death*, among other works.\r\n \r\n Webinar ID\r\n 924 1095 7575\r\n https:\/\/umich.zoom.us\/j\/92410957575\r\n \r\nCosponsor: National Association for Armenian Studies and Research (NAASR)\r\n\r\n*Accommodation: If there is anything we can do to make this event accessible to you, please contact us. Please be aware that advance notice is necessary as some accommodations may require more time for the university to arrange.\r\n Email: -- armenianstudies@umich.edu", "occurrence_notes":null, "guid":"142562-21891156@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/142562", "building_id":"1000165", "building_name":"Weiser Hall", "campus_maps_id":"47", "room":"555", "location_name":"Weiser Hall", "has_livestream":0, "cost":"", "tags":["Book","Lecture","Discussion","diaspora","Complit","comparative literature","Armenian Studies"], "website":"https:\/\/umich.zoom.us\/j\/92410957575", "sponsors":[ { "group_name":"Center for Armenian Studies", "group_id":"3124", "website":"http:\/\/www.ii.umich.edu\/armenian" }, { "group_name":"Comparative Literature", "group_id":"1103", "website":"" }, { "group_name":"International Institute", "group_id":"1968", "website":"http:\/\/www.ii.umich.edu" }, { "group_name":"Center for Russian, East European, and Eurasian Studies", "group_id":"3097", "website":"http:\/\/www.ii.umich.edu\/crees" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_thumb\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/01\/event_142562_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/event_142562_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21891156 } }