Brauer factor sets and simple algebras

Author:

Rowen Louis H.

Abstract

It is shown that the Brauer factor set ( c i j k ) ({c_{ijk}}) of a finite-dimensional division algebra of odd degree n n can be chosen such that c i j i = c i i j = c j i i = 1 {c_{iji}} = {c_{iij}} = {c_{jii}} = 1 for all i , j i,j and c i j k = c k j i 1 {c_{ijk}} = c_{kji}^{ - 1} . This implies at once the existence of an element a 0 a \ne 0 with tr ( a ) = tr ( a 2 ) = 0 {\text {tr}}(a) = {\text {tr}}({a^2}) = 0 ; the coefficients of x n 1 {x^{n - 1}} and x n 2 {x^{n - 2}} in the characteristic polynomial of a a are thus 0 0 . Also one gets a generic division algebra of degree n n whose center has transcendence degree n + ( n 1 ) ( n 2 ) / 2 n + (n - 1)(n - 2)/2 , as well as a new (simpler) algebra of generic matrices. Equations are given to determine the cyclicity of these algebras, but they may not be tractable.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference8 articles.

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4. The center of the ring of 3×3 generic matrices;Formanek, Edward;Linear and Multilinear Algebra,1979

5. Brauer factor sets, Noether factor sets, and crossed products;Jacobson, Nathan,1983

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