{
    "152182-21913184":
    {
        "datetime_modified":"20261025T165532",
        "datetime_start":"20261026T160000",
        "datetime_end":"20261026T170000",
        "has_end_time":1,
        "date_start":"2026-10-26",
        "date_end":"2026-10-26",
        "time_start":"16:00:00",
        "time_end":"17:00:00",
        "time_zone":"America\/Detroit",
        "event_title":"Dynamics Seminar: Automorphisms of the Grand Arc Graph",
        "occurrence_title":"",
        "combined_title":"Dynamics Seminar: Automorphisms of the Grand Arc Graph: Arya Vadnere, University of Buffalo",
        "event_subtitle":"Arya Vadnere, University of Buffalo",
        "event_type":"Lecture \/ Discussion",
        "event_type_id":"13",
        "description":"Mapping class groups of finite-type surfaces have often been studied via their action on various graphs, whose vertices correspond to homotopy classes of certain arcs or curves on the surface, with edges between homotopically disjoint arcs or curves. In 2006, Ivanov posed a \u200b\"metaconjecture\": every object naturally associated to a surface, which admits an action of the mapping class group, with sufficiently rich structure has its group of automorphisms be the mapping class group. This is true for a lot of these arc\/curve graphs \u2014 in particular, this means that the combinatorial structure of these graphs perfectly captures the topology of the surface. \n\nIn this talk, we shall explore Ivanov\u2019s metaconjecture for mapping class groups of infinite-type surfaces. We shall focus on the action on \u201cthe grand arc graph\u201d, first introduced by Bar-Natan\u2014Verberne, which is an infinite-diameter, hyperbolic graph defined on a large class of infinite-type surfaces. This talk contains joint work with G. Shaji.",
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        "room":"3096",
        "location_name":"East Hall",
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        "tags":["Dynamics"],
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                "group_name":"Complex Analysis, Dynamics and Geometry Seminar - Department of Mathematics",
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    {
        "datetime_modified":"20261017T105456",
        "datetime_start":"20261026T160000",
        "datetime_end":"20261026T170000",
        "has_end_time":1,
        "date_start":"2026-10-26",
        "date_end":"2026-10-26",
        "time_start":"16:00:00",
        "time_end":"17:00:00",
        "time_zone":"America\/Detroit",
        "event_title":"GLNT: Analytic approaches to factorization of singular moduli",
        "occurrence_title":"",
        "combined_title":"GLNT: Analytic approaches to factorization of singular moduli: Yingkun Li (Wisconsin)",
        "event_subtitle":"Yingkun Li (Wisconsin)",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"Abstract: In the 1980s, Gross and Zagier proved factorization formula for norm of difference of singular moduli, on their way to the Gross-Zagier formula. In that work, there were two approaches, one algebraic and one analytic. It turns out that the algebraic approach could produce factorization before taking the norm, whereas the analytic approach could not. In this talk, I will report on-going work with Mike Daas, where we aim to remove the norm through a p-adic analytic approach in the case of Shimura curves.",
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                "guid":"153219-21915436@events.umich.edu",
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        "room":"4088",
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        "tags":["Mathematics"],
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        "sponsors":[
             {
                "group_name":"Group, Lie and Number Theory Seminar - Department of Mathematics",
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