Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 38 2 2012 07 15 Ring structures of mod p equivariant cohomology rings and ring homomorphisms between them529 542 en Yanchang Chen College of Mathematics and Information Science, Hebei Normal University, Yuhua Road 113, Shijiazhuang 050016, P. R. China Yanying Wang College of Mathematics and Information Science, Hebei Normal University, Yuhua Road 113, Shijiazhuang 050016, P. R. China 2010 10 18