Here are preliminary transparencies for lectures:

- Part 1, Moduli of Twisted Stable Maps, in postscript, dvi, or the TEX source.
- Part 2, Quantum Cohomology of Orbifolds, in postscript, dvi, or the TEX source.
- Part 3, Stringy Orbifold Cohomology: Theory and Examples, in postscript, dvi, or the TEX source.

here is the paper "Algebraic Orbifold Quantum products", by Tom Graber, Angelo Vistoli and me, on which the course is based. In postscript or dvi

A hopefully reasonable introduction for part 1 is in Complete moduli for families over semistable curves, written by Angelo Vistoli and me.

The work of Weimin Chen and Yongbin Ruan:

A New Cohomology Theory for Orbifold, Orbifold Quantum Cohomology, and Orbifold Gromov-Witten Theory

The paper Orbifold cohomology for global quotients by Barbara Fantechi and Lothar Goettsche

The paper Orbifold Cohomology of the Symmetric Product by Bernardo Uribe