University of Colorado at BoulderSeminar on
STACKS AND GROUPOIDSFall 2009: Wednesdays 4:005:00 in MATH 350 

This is a working seminar meant to introduce algebraic and smooth stacks, groupoids, and orbifolds. The seminar will be held in Mathematics 350. The mathematics department is at the corner of Colorado Ave and Folsom St. For a map of the campus, click here. For parking instructions, click here. 
August 26  Sebastian CasalainaMartin and
Markus Pflaum 
Organizational meeting 
September 2  Sebastian CasalainaMartin  An introduction to stacks 
September 9  Sebastian CasalainaMartin  Stacks for everyone 
September 16  Markus Pflaum  Category theory, adjoint functors, and the Yoneda Lemma 
September 23  Markus Pflaum 
Category
theory, adjoint functors, and the Yoneda Lemma continued 
September 30  Markus Pflaum  Grothendieck topologies, sites, and sheaves 
October 7 
NO SEMINAR 
DELONG LECTURES OCTOBER
5, 7, 9 "Logic, Lie Theory and Operads" 
October 14  Markus Pflaum  Grothendieck
topologies, sites, and sheaves continued 
October 21  Arlan Ramsay  Introduction to groupoids 
October
2425 
GROUPOIDFEST 
GROUPOIDFEST 
October 28  SNOW DAY 
SNOW DAY 
November 4  Arlan Ramsay  Things
to do with groupoids 
November 11  Arlan Ramsay  Groupoids continued 
November 18  Christopher Seaton 
Introduction
to orbifolds and orbifold groupoids 
November 25  NO SEMINAR 
THANKSGIVING
BREAK 
December 2  Carla Farsi  Introduction
to orbifolds as stacks 
References:
Some further references:
