By David S. Dummit, Richard M. Foote

ISBN-10: 0471433349

ISBN-13: 9780471433347

Broadly acclaimed algebra textual content. This e-book is designed to offer the reader perception into the ability and wonder that accrues from a wealthy interaction among varied parts of arithmetic. The e-book conscientiously develops the speculation of other algebraic constructions, starting from easy definitions to a couple in-depth effects, utilizing various examples and routines to assist the reader's figuring out. during this method, readers achieve an appreciation for a way mathematical constructions and their interaction result in strong effects and insights in a couple of diversified settings.

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**Example text**

So we have that k[(, 9J]/(r12) H*(G k) 1 k[K] if p > 2, if p = 2. It is a technicality to check that the element rl E H' (G, k) for p > 2 squares to zero. Next suppose that we have an elementary abelian p-group G = (x1, ... , x") (Z/p)". It can be seen that kG = k(xl) 0 k(x2) 0 ... 0 k(x"). As a result, the trivial kG-module, k, has a projective resolution of the form P. = Pi,. 0 P2,* ® ... ® k Here Pi,* -`-3 k is a k(xi)-projective resolution as in the previous paragraph. The tensor product is over the coefficient ring k and the formula for the tensor product of the complexes is the usual Kiinneth formula.

37-64. [DW3] W. G. Dwyer and C. W. Wilkerson, The uniqueness of BDI(4), In preparation. [FP] Z. Fiedorowicz and S. Priddy, Homology of Classical Groups over Finite Fields and their Associated Infinite Loop Spaces, Springer Lecture Notes in Mathematics, 674 Springer-Verlag (1978). [Fr] E. Friedlander, Etale homotopy of simplicial schemes, Annals of Math. Studies, 104 Princeton Univ. Press (1982). [JM] S. Jackowski and J. McClure, Homotopy decomposition of classifying spaces via elementary abelian subgroups, Topology 31 (1992), pp.

First suppose that G = (x) is a cyclic group of order p. _+ P324 P224 P,24 Po where P, = kG for all i. Here a=(a) ((x-1)a ifiisodd, Sl if i is even. (x - 1)p-lci Now HomkG(Pi, k) = k and hence H'(G, k) = H`(HomkG(P*, k)) has dimension 1 in every degree. Notice further that the resolution repeats every two places and there is a surjective chain map of degree 2 (or degree 1 if p = 2). The chain map represents an element (in H2(G, k) (in H'(G, k) if p = 2). So we have that k[(, 9J]/(r12) H*(G k) 1 k[K] if p > 2, if p = 2.

### Abstract Algebra by David S. Dummit, Richard M. Foote

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