Dear Colleagues and Students,<\/p>\n
You are cordially invited to the Topology Seminar organized by the Department of Mathematics.
\nSpeaker: Redi Haderi (Bilkent)<\/p>\n
\u201c2-dimensional groups and H^3\u201d<\/p>\n
Abstract: We have seen that H^2 classifies certain group extensions last week. This week we will see what H^3 classifies and that will be equivalence classes of 2-dimensional groups. If we say that a group is a structure that describes symmetries then a 2-group is a structure that describes symmetries and symmetries between symmetries. We make this notion precise using 2-category theory (which will be reviewed to the extent we need). Then we prove that these are equivalent to crossed modules and 2-term extensions. Finally we describe how they are classified via H^3 of an appropriate group.<\/p>\n
Date: Monday, December 17, 2018
\nTime: 13:40
\nPlace: Mathematics Seminar Room, SA \u2013 141<\/p>\n","protected":false},"excerpt":{"rendered":"
Dear Colleagues and Students, You are cordially invited to the Topology Seminar organized by the Department of Mathematics. Speaker: Redi Haderi (Bilkent) \u201c2-dimensional groups and H^3\u201d Abstract: We have seen that H^2 classifies certain group extensions last week. This week we will see what H^3 classifies and that will be [\u2026] <\/p>\n