http://golem.ph.utexas.edu/category/2006/09/groupoids_and_stacks_in_physic.h... Groupoids and Stacks in Physics and Geometry Posted by John Baez MathML-enabled post (click for more details). From January 8th to April 6th of 2007, the Institut Henri Poincaré will be running a program on: * Groupoids and Stacks in Physics and Geometry If you don’t know about groupoids and stacks, or even if you do, try this overview of the subject. MathML-enabled post (click for more details). The program on Groupoids and Stacks in Physics and Geometry will feature the following workshops: * Higher structures in geometry and physics (Jan 15-Jan 19) Organizers: Alberto Cattaneo and Ping Xu * Quantum cohomology of stacks and string theory (Feb 12-Feb 16) Organizers: Kai Behrend, Barbara Fantechi and Andrew Kresch * Groupoids in operator algebras and noncommutative geometry (Feb 26-Mar 2) Organizers: Jean Renault and Jean-Louis Tu There will also be a number of long courses, including: * Kai Behrend and Andrew Kresch, Introduction to stacks * Lawrence Breen, Categorical Structures and cohomology * Jean-Louis Tu, Operator Algebras, K-theory and groupoids (abstract)(résumé) * Ping Xu, Lie groupoids and Poisson geometry (abstract) Some support is available for grad students to attend - see the program website. Posted at September 13, 2006 8:30 AM UTC