Hello everyone,
The next colloquium talk will be held on Monday, 4/4/2011, 12:15, Schreiber
006, Tel Aviv University. The speaker is
     Aviv Censor (Tel Aviv University)
and the title of his talk is
     Towards Topological Groupoidification
The abstract is given below. Tea and coffee at 12:00, same room.
Hope to see you there. For information about future colloquiua, see
You are all welcome to suggest colloquium speakers, especially for the next
academic year.
(Vladimir Rokhlin, who was supposed to give the lecture on April 4,
cancelled his visit to Israel).
Abstract: Groupoidification, a form of categorification, was introduced by
John Baez, James Dolan and Todd Trimble. It has been successfully applied to
several structures, which include Feynman Diagrams, Hecke Algebras and Hall
Algebras. In order to expand the scope of groupoidification and its inverse
process of degroupoidification, we take first steps in extending the theory
from the discrete setting to the realm of topology, measure theory and
analysis. In particular, we describe how to generalize two notions which
play key roles in the theory: groupoid cardinality and the weak-pullback
construction. This is a joint project with Daniele Grandini. The talk will
be suited for a general mathematical audience, prior acquaintance with
groupoids will not be assumed.
Technion Math Net-2 (TECHMATH2)
Editor: Michael Cwikel   <> 
Announcement from: Bo'az Klartag   <>