{"id":2226,"date":"2021-12-02T09:39:49","date_gmt":"2021-12-02T07:39:49","guid":{"rendered":"https:\/\/mathematics.haifa.ac.il\/?p=2226"},"modified":"2021-12-09T10:41:06","modified_gmt":"2021-12-09T08:41:06","slug":"u-haifa-topology-geometry-seminar-sunday-dec-5-2021-speaker-theo-johnson-freyd-dalhousie-perimeter-institute-title-algebraically-closed-higher-categories","status":"publish","type":"post","link":"https:\/\/mathematics.haifa.ac.il\/?p=2226","title":{"rendered":"U. Haifa Topology &#038; Geometry seminar: Sunday, Dec. 5, 2021. Speaker: Theo Johnson-Freyd (Dalhousie\/Perimeter Institute). &#8220;Title:\u00a0 Algebraically Closed Higher Categories&#8221;"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Time: <\/strong>Sunday December 5th 17:00 (Israel Time)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Location: <\/strong>On Zoom<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recording:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/us02web.zoom.us\/rec\/share\/MjyzxaBsbY7S1RGjShKMSBcfKtgqm8STy9-_KzeHeMdz8bwJhZ-F1wJuG0QhDrUv.aa8mS84tuLDHuHHs\">https:\/\/us02web.zoom.us\/rec\/share\/MjyzxaBsbY7S1RGjShKMSBcfKtgqm8STy9-_KzeHeMdz8bwJhZ-F1wJuG0QhDrUv.aa8mS84tuLDHuHHs<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Slides:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"http:\/\/categorified.net\/Haifa.pdf\">http:\/\/categorified.net\/Haifa.pdf<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Speaker: <\/strong>Theo Johnson-Freyd (Dalhousie\/Perimeter Institute)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Title: <\/strong>Algebraically Closed Higher Categories<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Abstract.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Super Tannakian duality can be interpreted as saying that the symmetric monoidal category Vec is not algebraically closed, but rather its algebraic closure is the category sVec of super vector spaces. In this talk, I will explain how to construct the algebraic closure of the symmetric monoidal n-category nVec. The Galois group is almost, but not quite, the stable orthogonal group. The cokernel of the J homomorphism appears in an interesting way. This is based on joint work in progress with David Reutter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ZOOM COORDINATES:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/us02web.zoom.us\/j\/84987591026?pwd=aTJWcFlOSldKck5leGt2d25CYkRqZz09\">https:\/\/us02web.zoom.us\/j\/84987591026?pwd=aTJWcFlOSldKck5leGt2d25CYkRqZz09<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Meeting ID: 849 8759 1026<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Time: Sunday December 5th 17:00 (Israel Time) Location: On Zoom Recording: https:\/\/us02web.zoom.us\/rec\/share\/MjyzxaBsbY7S1RGjShKMSBcfKtgqm8STy9-_KzeHeMdz8bwJhZ-F1wJuG0QhDrUv.aa8mS84tuLDHuHHs Slides: http:\/\/categorified.net\/Haifa.pdf Speaker: Theo Johnson-Freyd (Dalhousie\/Perimeter Institute) Title: Algebraically Closed Higher Categories Abstract. Super Tannakian duality can be interpreted as saying that the symmetric monoidal category Vec is&#8230;<br \/><a class=\"read-more-button\" href=\"https:\/\/mathematics.haifa.ac.il\/?p=2226\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,4],"tags":[],"class_list":["post-2226","post","type-post","status-publish","format-standard","hentry","category-gt-seminar","category-seminar"],"_links":{"self":[{"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=\/wp\/v2\/posts\/2226","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2226"}],"version-history":[{"count":3,"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=\/wp\/v2\/posts\/2226\/revisions"}],"predecessor-version":[{"id":2232,"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=\/wp\/v2\/posts\/2226\/revisions\/2232"}],"wp:attachment":[{"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mathematics.haifa.ac.il\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}