Multiplicative Automorphisms of Incidence Algebras

Rosali Brusamarello Departamento de Matemática, Universidade Estadual de Maringá, Maringá, Brazil

Érica Z. Fornaroli Departamento de Matemática, Universidade Estadual de Maringá, Maringá, Brazil

Ednei A. Santulo Jr. Departamento de Matemática, Universidade Estadual de Maringá, Maringá, BrazilCorrespondence[email protected]

Abstract

We present necessary and sufficient conditions for a multiplicative automorphism of an incidence algebra of a finite partially ordered set X to be an inner automorphism. These conditions are related to the structure of X as a directed graph.

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Notes

Communicated by I. Shestakov.

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Multiplicative Automorphisms of Incidence Algebras

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Multiplicative Automorphisms of Incidence Algebras

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