  This is a revised and shortened version of our paper "Equivariant
intersection theory" (alg-geom/9603008). In particular, the sections on
Riemann-Roch and localization are omitted. They will appear in separate papers,
at which time alg-geom/9603008 will become obsolete. We have intsead added a
section of examples, and have include a calculation of the integral Chow ring
of the mdouli stack of elliptic curves.
