Homology stability for the special linear group of a field and Milnor-Witt K-theory

Details Homology stability for the special linear group of a field and Milnor-Witt K-theory Homology stability for the special linear group of a field and Milnor-Witt K-theory

2008-11-13

arxiv.org/abs/0811.2110v2

Mathematics

K-Theory and Homology

43 pages. The main theorem has been sharpened. Some definitions and proofs simplified

Scientific paper

Let F be a field of characteristic zero and let f(t,n) be the stabilization homomorphism from the n-th integral homology of SL(t,F) to the n-th homology of SL(t+1,F). We prove the following results: For all n, f(t,n) is an isomorphism if t is at least n+1, and is surjective for t=n, confirming a conjecture of C-H. Sah. Furthermore if n is odd, then f(n,n) is an isomorphism and when n is even the kernel of f(n,n) is the (n+1)st power of the fundamental ideal of the Witt Ring of the field.. If n is even, then the cokernel of f(n-1,n) is naturally isomorphic to the n-th Milnor-Witt K-group of F, MWK(n,F) and when n>2 is odd the cokernel of f(n-1,n) is the square of the nth Milnor K-group of F.

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