{ "141895-21889610": { "datetime_modified":"20260121T171348", "datetime_start":"20260130T150000", "datetime_end":"20260130T160000", "has_end_time":1, "date_start":"2026-01-30", "date_end":"2026-01-30", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"AIM Seminar: The Algebra of Scientific Doubt: From Noether to Noise, from Ritt to the Unknown", "occurrence_title":"", "combined_title":"AIM Seminar: The Algebra of Scientific Doubt: From Noether to Noise, from Ritt to the Unknown: Lior Horesh (IBM Research)", "event_subtitle":"Lior Horesh (IBM Research)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Abstract: Scientific progress is defined by a fundamental asymmetry: a theory feels complete until the moment it is proven wrong. In mathematical modeling, we often operate within axiomatic systems, (conservation laws, symmetries, and invariants), that are inevitably incomplete. The central challenge of automated discovery is abduction: can we reason backward from observed phenomena to identify the missing principles that our axioms fail to capture?\n\nIn this talk, I will outline a program for the systematic discovery of physical laws through the lens of algebraic geometry. Building on the AI-Noether framework, which utilized Hilbert's Nullstellensatz and Noether's primary decomposition (I=\u22c2qi) for abductive discovery in exact polynomial settings, we now extend this machinery into two new frontiers. \n\nFirst, we address the \"brittleness\" of symbolic computation by embracing Numerical Algebraic Geometry. Using homotopy continuation and witness sets, we move beyond exact arithmetic to achieve scalable, noise-robust inference in empirical data. Second, we transition from static constraints to dynamical systems via Differential Algebra. By shifting from Hilbert\u2019s Basis Theorem to Ritt\u2019s, and from Gr\u00f6bner bases to Rosenfeld-Gr\u00f6bner characteristic sets, we enable the native discovery of differential equations directly from observations.\n\nThe power of this synthesis is already emerging. Preliminary applications to a series of long-standing open problems in mathematical physics suggest that this framework can identify candidate laws and hidden symmetries where classical derivation has stalled. We are finally positioned to venture into genuinely unknown territory: the discovery of fundamental principles that have remained, until now, just beyond human reach.\n\nContact: Shravan Veerapaneni", "occurrence_notes":null, "guid":"141895-21889610@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141895", "building_id":"1000166", "building_name":"East Hall", "campus_maps_id":"53", "room":"1084", "location_name":"East Hall", "has_livestream":0, "cost":"", "tags":["Mathematics"], "website":"", "sponsors":[ { "group_name":"Applied Interdisciplinary Mathematics (AIM) Seminar - Department of Mathematics", "group_id":"4882", "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":21889610 } , "144755-21895816": { "datetime_modified":"20260129T105015", "datetime_start":"20260130T150000", "datetime_end":"20260130T160000", "has_end_time":1, "date_start":"2026-01-30", "date_end":"2026-01-30", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Booking International Flights on a Budget", "occurrence_title":"", "combined_title":"Booking International Flights on a Budget", "event_subtitle":"", "event_type":"Presentation", "event_type_id":"16", "description":"Come to this session to hear tips about booking international flights on a budget. We will include a live demo on how to book a flight and there will also be time for Q&A after the presentation. If you're new to booking international flights, this workshop is for you!\n\nThis event is part of the Global Wolverines: Preparing You to Have a Successful International Experience event series.\n\nhttps:\/\/internationalcenter.umich.edu\/abroad\/ic-global-wolverines", "occurrence_notes":null, "guid":"144755-21895816@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144755", "building_id":"null", "building_name":"Off Campus Location", "campus_maps_id":"1", "room":"", "location_name":"Virtual", "has_livestream":1, "livestream_type":"other", "livetream_require_login":0, "livestream_id":"", "livestream_link":"", "cost":"", "tags":["Abroad","International"], "website":"https:\/\/sessions.studentlife.umich.edu\/track\/event\/session\/104002", "sponsors":[ { "group_name":"International Center", "group_id":"1060", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/01\/event_144755_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/event_144755_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/01\/event_144755_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/01\/event_144755_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/01\/event_144755_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/01\/event_144755_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/event_144755_original-1.png" }, "occurrence_count":1, "first_occurrence":21895816 } , "143131-21892188": { "datetime_modified":"20260206T030401", "datetime_start":"20260130T150000", "datetime_end":"20260130T160000", "has_end_time":1, "date_start":"2026-01-30", "date_end":"2026-01-30", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"HET Seminar | Energy Correlators in Particle Physics, QFT and Gravity", "occurrence_title":"", "combined_title":"HET Seminar | Energy Correlators in Particle Physics, QFT and Gravity: Ian Moult (Yale)", "event_subtitle":"Ian Moult (Yale)", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Detector operators, of which the average null energy operator provides the most famous example, arise as direct theoretical models of asymptotic measurements in collider experiments. In QFT, detector operators are expressed in terms of \"light-ray operators\", whose correlation functions provide an interesting class of non-perturbatively well-defined observables. \n\nIn this talk, I will give an overview of light-ray\/ detector operators, and attempt highlight the different perspectives and motivations for studying these operators, coming from the CFT, amplitudes and phenomenological communities. I will then present recent measurements of these correlators in experiment, as well as applications to positivity bounds on OPE coefficients.", "occurrence_notes":null, "guid":"143131-21892188@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143131", "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","Physics","Science","Seminar","Talk"], "website":"", "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics", "group_id":"4286", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "website":"" }, { "group_name":"HET Seminars", "group_id":"3806", "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":21892188 } , "95236-21895061": { "datetime_modified":"20260121T144347", "datetime_start":"20260130T150000", "datetime_end":"20260130T160000", "has_end_time":1, "date_start":"2026-01-30", "date_end":"2026-01-30", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"LSA Campus Tours for Transfer Students", "occurrence_title":"", "combined_title":"LSA Campus Tours for Transfer Students", "event_subtitle":"", "event_type":"Reception \/ Open House", "event_type_id":"17", "description":"Join the LSA Transfer Student Ambassadors for a central campus tour and to learn all about the transfer student experience. As transfer students, the Ambassadors understand the questions you have and designed a tour with the needs of transfer students in mind.\n\nPlease register using the link to the right.", "occurrence_notes":null, "guid":"95236-21895061@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/95236", "building_id":"1000150", "building_name":"LSA Building", "campus_maps_id":"87", "room":"1180 (Transfer Student Center)", "location_name":"LSA Building", "has_livestream":0, "cost":"", "tags":["transfer","Transfer Student Center","Transfer Students"], "website":"https:\/\/events.blackthorn.io\/en\/Hn1RKit7\/g\/1mzVXSHRqX", "sponsors":[ { "group_name":"LSA Transfer Student Center", "group_id":"4442", "website":"" }, { "group_name":"LSA Student Recruitment", "group_id":"4928", "website":"https:\/\/lsa.umich.edu\/lsa\/faculty-staff\/undergraduate-education\/student-recruitment.html" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2022\/05\/event_95236_original-1.jpeg" }, "occurrence_count":5, "first_occurrence":21895061 } , "141325-21892207": { "datetime_modified":"20260310T094417", "datetime_start":"20260130T150000", "datetime_end":"20260130T154500", "has_end_time":1, "date_start":"2026-01-30", "date_end":"2026-01-30", "time_start":"15:00:00", "time_end":"15:45:00", "time_zone":"America\/Detroit", "event_title":"Sky Tonight", "occurrence_title":"", "combined_title":"Sky Tonight", "event_subtitle":"", "event_type":"Exhibition", "event_type_id":"7", "description":"A live presentation on what to find in the sky tonight and for the coming few weeks. This presentation includes how to find the cardinal directions with the North Star, current and upcoming constellations, visible planets, a few deep sky objects depending on the season, and other interesting astronomical visualizations. If you want to be able to look up from your own backyard and know what to look for, this is the show for you.", "occurrence_notes":"Tickets available in museum store", "guid":"141325-21892207@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/141325", "building_id":"1005169", "building_name":"Museum of Natural History", "campus_maps_id":"646", "room":"Planetarium & Dome Theater", "location_name":"Museum of Natural History", "has_livestream":0, "cost":"Tickets are $8 and are available in the museum store on the day of the show.", "tags":["Astronomy","Children","Family","Museum","museums","natural history museum","Natural Sciences","Planetarium","Prospective Undergraduate Students","Science","Space","Undergraduate"], "website":"https:\/\/lsa.umich.edu\/ummnh\/visitors\/planetarium-dome-theater.html#view=week", "sponsors":[ { "group_name":"Planetarium & Dome Theater at the Museum of Natural History", "group_id":"3825", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2025\/10\/event_141325_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2025\/10\/event_141325_original-1.jpg" }, "occurrence_count":164, "first_occurrence":21888587 } , "143772-21893993": { "datetime_modified":"20260114T104637", "datetime_start":"20260130T150000", "datetime_end":"20260130T163000", "has_end_time":1, "date_start":"2026-01-30", "date_end":"2026-01-30", "time_start":"15:00:00", "time_end":"16:30:00", "time_zone":"America\/Detroit", "event_title":"Sociocultural Anthropology Colloquium | \u201cHopesick: Care and Community in America\u2019s Opioid Crisis\u201d", "occurrence_title":"", "combined_title":"Sociocultural Anthropology Colloquium | \u201cHopesick: Care and Community in America\u2019s Opioid Crisis\u201d: China Scherz: Kristin Yudt Collegiate Professor of Global Affairs, Keough School of Global Affairs, University of Notre Dame", "event_subtitle":"China Scherz: Kristin Yudt Collegiate Professor of Global Affairs, Keough School of Global Affairs, University of Notre Dame", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"\u201cFor many Christians, the belief that God can and does act directly in the world can be a tremendous source of hope. Against seemingly insurmountable challenges, there is a sense that the miraculous may truly be possible. And yet, things don\u2019t always work out. In this talk, I explore these dynamics of hope and disappointment through the life of a young woman living with opioid use disorder in Central Appalachia. Drawing on five years of collaborative ethnographic fieldwork in non-denominational churches and clinics providing Medications for Opioid Use Disorder (MOUD), this talk considers the theological and interpersonal stakes of hope and despair in Appalachian communities living through the on-going opioid crisis. In it, I explore the vernacular use of the term \u2018hopesick\u2019 as a possible alternative to concepts of co-dependent resentment, compassion fatigue, and abandonment. Moving beyond moments of hopesick rage and grief, the later sections of the talk explore what we might learn from recovering \u2018hopefiends\u2019 who have found less risky ways to engage with the euphoric highs of hope so that they may continue on with greater compassion for themselves and others.\u201d\r\n\r\nChina Scherz is the Kristin Yudt Collegiate Professor of Global Affairs in the Keough School of Global Affairs at the University of Notre Dame. Prior to arriving at Notre Dame, Scherz was an associate professor of anthropology at the University of Virginia. She earned a Ph.D. in medical anthropology from the Universities of California at San Francisco and Berkeley and a B.A. in anthropology from the University of California at Berkeley. Scherz\u2019s work examines how health and well-being are fostered through care, connection, and community. Across a series of projects, she has also explored how people decide who they should care for and how they ought to care for them and the ways in which spiritual experiences intersect with processes of ethical transformation.", "occurrence_notes":null, "guid":"143772-21893993@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/143772", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"411", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["AEM Featured","american culture","Anthropology","colloquium","Global Health","Health","Health & Wellness","Sociology"], "website":"https:\/\/lsa.umich.edu\/anthro", "sponsors":[ { "group_name":"Department of Anthropology", "group_id":"3469", "website":"https:\/\/lsa.umich.edu\/anthro" }, { "group_name":"Museum of Anthropological Archaeology", "group_id":"3760", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/01\/event_143772_original-1.png", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/crop-event_143772_original-1.png" }, "occurrence_count":1, "first_occurrence":21893993 } , "144463-21895389": { "datetime_modified":"20260125T223925", "datetime_start":"20260130T150000", "datetime_end":"20260130T160000", "has_end_time":1, "date_start":"2026-01-30", "date_end":"2026-01-30", "time_start":"15:00:00", "time_end":"16:00:00", "time_zone":"America\/Detroit", "event_title":"Student Algebraic Geometry: Variation of GIT", "occurrence_title":"", "combined_title":"Student Algebraic Geometry: Variation of GIT: Ritwick Bhargava", "event_subtitle":"Ritwick Bhargava", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Let G be a reductive group acting on a quasi-projective variety X. The construction of the geometric invariant theory (GIT) quotient of X by G depends on the choice of an ample line bundle on X with a compatible action of G. Changing this line bundle often results in a birational map of GIT quotients (a flip), which aids in understanding the birational geometry of these spaces. 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