Whitehead groups of finite groups by Robert Oliver PDF

By Robert Oliver

ISBN-10: 0511600658

ISBN-13: 9780511600654

ISBN-10: 0521336465

ISBN-13: 9780521336468

This book's objective is to make obtainable concepts for learning Whitehead teams of finite teams, in addition to a number of comparable themes resembling induction conception and p-adic logarithms. the writer has incorporated a long advent to set the scene for non-specialists who wish an summary of the sector, its heritage and its functions. the remainder of the e-book involves 3 components: normal thought, team earrings of p-groups and common finite teams. The publication may be welcomed through experts in okay- and L-theory and by means of algebraists commonly as a state-of-the artwork survey of the realm.

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R Morita equivalence between two rings bimodule and i. , for some bimodule 0S, MORN=S and : as bimodules. 9, Mn(D) are inverse For any ring mn R (Mn(R),R)-bimodule. are precisely Ki(Mn(R)) = Ki(R) with CL those induced by identifying GLm(S) In Theorem N ®S M=R K1(S). The simplest example of this is a matrix algebra. and any n > 1, A is an "invertible" S (R). that any maximal 2P order in a simple a division algebra) is conjugate to a matrix (D algebra over the maximal order in D. This is not the case for maximal Z-orders in simple Q-algebras; but a result which is almost as good can be stated in terms of Morita equivalence.

Is a radical ideal) will I2 = 0. R and any ideal (l+rx) E R*, 0 due to Vaserstein [1], is often K1(R,I), useful, and helps to simplify some of x E I In particular, the maps GLn(a): CLn(R) - CLn(S) (any n K1(R) is any commutative 2p order. S eptmorphtsm, then then I C R, (l+xr) E R* and (l+rx)(l+xr)-1 E E(R,I). if r E R and If is a radical ideal (t. , I 35 BASIC ALGEBRAIC BACKGROUND CHAPTER 1. I C J(R)), K1(R,I) = (1+I)/((l+rx)(l+xr)-1 then r E R, x E I). : In particular, K1(R,I) = I/(rx - xr : rER, xE I) if I2 = 0.

For ,each n> 1, length n let w C(w) = orbit of be the set of formal (ordered) monomials of W. in two variables a, b. ab k(w) = number of occurrences of r(w) = coefficient of k$w) (-1)n-i-1 1 To see the formula for w in Log(1+a+b+ab) in (k(w) ) r-i 1 i=O ``(k(w)) w set w E W,,, under cyclic permatations W. in For i /' r(w), note that for each ways as a product of and (ab)'s i w i, n-2i a's can be written in or b's. i Fix an ideal ICJ and elements x,y E I. For any n > 1, any wEW,,, and any w' EC(w), w' is a cyclic permutation of w, and so (mod w'(x,y) = w(x,y) for some i,j such that i+j =n.

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Whitehead groups of finite groups by Robert Oliver

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