Thursday, September 26, 2013 - 12:00 to 13:00

427 Thackeray Hall

### Abstract or Additional Information

In the first talk, we introduced sheaves under Grothendieck topology and categories fibered in groupoids. We will continue to define algebraic stacks and Deligne-Mumford Stacks. The main examples we bear in mind are moduli spaces of curves and moduli stacks of principle bundles over curves. The references are