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Published online by Cambridge University Press: 24 October 2008
Extra special p-groups are groups which are central extensions of ℤ/p by elementary abelian p-groups. The cohomology ring of these groups occupies an important place in equivariant cohomology theories and in representation theories. Quillen[6] decided the cohomology for p = 2 and Tezuka-Yagita [7] studied the varieties defined by its mod p cohomology for odd prime p. However, for applications we need more information about the behaviour of the Hochschild-Serre spectral sequence (see [3] p. 295, [1] p. 6).