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Algebras with Collapsing Monomials

Algebras with Collapsing Monomials A semigroup S is called collapsing if there exists a positive integer n such that for every subset of n elements in S, at least two distinct words of length n on these letters are equal in S. In particular, S is collapsing whenever it satisfies a law. Let U(A) denote the group of units of a unitary associative algebra A over a field k of characteristic zero. If A is generated by its nilpotent elements, then the following conditions are equivalent: U(A) is collapsing; U(A) satisfies some semigroup law; U(A) satisfies the Engel condition; U(A) is nilpotent; A is nilpotent when considered as a Lie algebra. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the London Mathematical Society Wiley

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References (16)

Publisher
Wiley
Copyright
© London Mathematical Society
ISSN
0024-6093
eISSN
1469-2120
DOI
10.1112/S0024609398004597
Publisher site
See Article on Publisher Site

Abstract

A semigroup S is called collapsing if there exists a positive integer n such that for every subset of n elements in S, at least two distinct words of length n on these letters are equal in S. In particular, S is collapsing whenever it satisfies a law. Let U(A) denote the group of units of a unitary associative algebra A over a field k of characteristic zero. If A is generated by its nilpotent elements, then the following conditions are equivalent: U(A) is collapsing; U(A) satisfies some semigroup law; U(A) satisfies the Engel condition; U(A) is nilpotent; A is nilpotent when considered as a Lie algebra.

Journal

Bulletin of the London Mathematical SocietyWiley

Published: Sep 1, 1998

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