Galois module structure of Milnor K-theory in characteristic p

Details Galois module structure of Milnor K-theory in characteristic p Galois module structure of Milnor K-theory in characteristic p

2004-05-26

arxiv.org/abs/math/0405503v5

New York J. Math. 14 (2008), 215--224

Mathematics

Number Theory

v5 (10 pages); revised introduction and shortened paper; incorporated and acknowledged suggestions by readers of earlier versi

Scientific paper

Let E be a cyclic extension of degree p^n of a field F of characteristic p. Using arithmetic invariants of E/F we determine k_mE, the Milnor K-groups K_mE modulo p, as Fp[Gal(E/F)]-modules for all m in N. In particular, we show that each indecomposable summand of k_mE has Fp-dimension a power of p. That all powers p^i, i=0,1,...,n, occur for suitable examples is shown in a subsequent paper [MSS2], where additionally the main result of this paper becomes an essential induction step in the determination of K_mE/p^sK_mE as (Z/p^sZ)[Gal(E/F)]-modules for all m, s in N.

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