Ring structures of mod p equivariant cohomology rings and ring homomorphisms between them

In this paper، we consider a class of connected oriented (with respect to Z/p) closed G-manifolds with a non-empty finite fixed point set، each of which is G-equivariantly formal، where G = Z/p and p is an odd prime. Using localization theorem and equivariant index، we give an explicit description of the mod p equivariant cohomology ring of such a G-manifold in terms of algebra. This makes it possible to determine the number of equivariant cohomology rings (up to isomorphism) of such 2-dimensional G-manifolds. Moreover، we obtain a description of the ring homomorphism between equivariant cohomology rings of such two G-manifolds induced by a G-equivariant map، and show a characterization of the ring homomorphism. KeywordsG-manifold; equivariant index; equivariant cohomology; ring homomorphismMain Subjects55-XX Algebraic topology; 57-XX Manifolds and cell complexes; 58-XX Global analysis، analysis on manifolds