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    "152075-21912805":
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        "datetime_modified":"20260914T073549",
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        "date_start":"2026-09-16",
        "date_end":"2026-09-16",
        "time_start":"15:00:00",
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        "time_zone":"America\/Detroit",
        "event_title":"Non-positively curved spaces",
        "occurrence_title":"",
        "combined_title":"Non-positively curved spaces: Persy Zhu",
        "event_subtitle":"Persy Zhu",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"The CAT(0) inequality says that in non-positively curved spaces triangles are no fatter than the Euclidean ones. The richest examples are symmetric spaces of non-compact type, which carry Riemannian, CAT(0), and Lie group structures at once. Using SL(n,\\R)\/SO(n) as a running example, I will explain why flats are important, and how to describe points at infinity in those spaces.  Then I'll say a bit about some work on boundaries of horospheres, and end with something hopefully interesting: dynamics on those spaces and how we use them to get counting results.",
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        "tags":["Mathematics"],
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