The Subalgebra of Finite Support in an Incidence Algebra: Communications in Algebra: Vol 34, No 9

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Abstract

The automorphisms of the subalgebra of elements of finite support in the incidence algebra are described, and it is shown when this subalgebra is algebraically determined within the incidence algebra.

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ACKNOWLEDGMENT

The author thanks the referee for suggesting alternative (iii) of Lemma 1.

Notes

Communicated by J. Kuzmanovich.

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The Subalgebra of Finite Support in an Incidence Algebra

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