Representation Theory of Finite Semigroups, Semigroup Radicals and Formal Language Theory

Details Representation Theory of Finite Semigroups, Semigroup Radicals and Formal Language Theory Representation Theory of Finite Semigroups, Semigroup Radicals and Formal Language Theory

2007-02-14

arxiv.org/abs/math/0702400v1

Mathematics

Group Theory

Scientific paper

In this paper we characterize the congruence associated to the direct sum of all irreducible representations of a finite semigroup over an arbitrary field, generalizing results of Rhodes for the field of complex numbers. Applications are given to obtain many new results, as well as easier proofs of several results in the literature, involving: triangularizability of finite semigroups; which semigroups have (split) basic semigroup algebras, two-sided semidirect product decompositions of finite monoids; unambiguous products of rational languages; products of rational languages with counter; and \v{C}ern\'y's conjecture for an important class of automata.

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