{
    "146675-21899445":
    {
        "datetime_modified":"20260317T103853",
        "datetime_start":"20260318T143000",
        "datetime_end":"20260318T153000",
        "has_end_time":1,
        "date_start":"2026-03-18",
        "date_end":"2026-03-18",
        "time_start":"14:30:00",
        "time_end":"15:30:00",
        "time_zone":"America\/Detroit",
        "event_title":"Learning seminar in algebraic combinatorics: The Fundamental Theorem of Finite Semidistributive Lattices",
        "occurrence_title":"",
        "combined_title":"Learning seminar in algebraic combinatorics: The Fundamental Theorem of Finite Semidistributive Lattices: Grant Barkley",
        "event_subtitle":"Grant Barkley",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"Last time, we saw that the lattice of torsion classes is completely semidistributive. Motivated in part by this fact, Reading\u2013Speyer\u2013Thomas proved a fundamental theorem of finite semidistributive lattices. We'll give the necessary definitions to state the theorem, give some examples, and explain the connection to torsion classes. Time permitting, we will also describe canonical join representations and the canonical join complex of a finite semidistributive lattice.",
        "occurrence_notes":null,
                "guid":"146675-21899445@events.umich.edu",
        "permalink":"http:\/\/events.umich.edu\/event\/146675",
        "building_id":"1000166",
        "building_name":"East Hall",
        "campus_maps_id":"53",
        "room":"4088",
        "location_name":"East Hall",
        "has_livestream":0,
        "cost":"",
        "tags":["Mathematics"],
        "website":"",
        "sponsors":[
             {
                "group_name":"Learning Seminar in Algebraic Combinatorics - Department of Mathematics",
                "group_id":"4894",
                "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":21899445
    }    ,    "146639-21899375":
    {
        "datetime_modified":"20260316T091303",
        "datetime_start":"20260318T143000",
        "datetime_end":"20260318T153000",
        "has_end_time":1,
        "date_start":"2026-03-18",
        "date_end":"2026-03-18",
        "time_start":"14:30:00",
        "time_end":"15:30:00",
        "time_zone":"America\/Detroit",
        "event_title":"Student Number Theory: Counting points on hyperelliptic curves over finite fields",
        "occurrence_title":"",
        "combined_title":"Student Number Theory: Counting points on hyperelliptic curves over finite fields: Alex Sheng",
        "event_subtitle":"Alex Sheng",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"I will explain elementary methods for computing the zeta function of an arithmetic scheme over a finite field, focusing on the case of hyperelliptic curves. It turns out that the number of points on such curves over a finite field can be packaged into traces of certain explicit matrices (called Hasse-Witt matrices) constructed from some coefficients of suitable powers of the defining polynomial. A highlight of this approach is that it is entirely elementary, in the sense that no cohomology is involved. I will also discuss efficient algorithms for computation and their complexity.",
        "occurrence_notes":null,
                "guid":"146639-21899375@events.umich.edu",
        "permalink":"http:\/\/events.umich.edu\/event\/146639",
        "building_id":"1000166",
        "building_name":"East Hall",
        "campus_maps_id":"53",
        "room":"3088",
        "location_name":"East Hall",
        "has_livestream":0,
        "cost":"",
        "tags":["Mathematics"],
        "website":"",
        "sponsors":[
             {
                "group_name":"Student Number Theory Seminar - Department of Mathematics",
                "group_id":"4906",
                "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":21899375
    }    }