Hebrew University Amitsur Algebra Seminar ***************************** Time: Thursday, February 17, at 12:00. Place: room 209, Mathematics building Speaker: Emmanuel Farjoun (HUJI) Title: A homotopy view of normal subgroups. Abstract: Homotopy theory defines for each group homomorphism G--->H the Borel quotient, H//G, a certain canonical topological orbit space quotient used in Borel's equivarient cohomology. This raises the question of possible topological group structures on this Borel quotient H//G, which leads to a homotopy notion of normal subgroups N--->G. Certain well-known canonical central extensions E--->G are always normal in this sense. We shall try to classify them and discuss appliations of this extension of normalty. (Join work with Y. Segev.) You are cordially invited! <http://math.huji.ac.il/amitsur.html> --------------------------------------------------------- Technion Math Net-2 (TECHMATH2) Editor: Michael Cwikel <techm@math.technion.ac.il> Announcement from: Gili Schul <gili.schul@mail.huji.ac.il>