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arXiv 0904.4874math.RA
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关于Hom-结合代数的酉性条件

On unitality conditions for Hom-associative algebras

Yael Fregier, Aron Gohr

摘要:

在hom-associative结构中,结合性条件$(xy)z=x(yz)$被扭曲为$α(x)(yz) = (xy)α(z)$,其中$α$是适当范畴中的映射。本文考虑了hom-结合代数的两个不同的酉性条件。第一种是经典意义上的单位存在性,它比第二种强,我们称之为弱么正性。给出了有单位元的HOM-结合代数的结合性条件与扭曲映射象的大小的关系。同时研究了任意的hom-结合代数嵌入到单位代数或弱单位代数中的问题。最后,我们证明了具有双射扭映射的弱酉hom-结合代数是结合代数的扭形式。

英文摘要:

In hom-associative structures, the associativity condition $(xy)z=x(yz)$ is twisted to $α(x)(yz) = (xy)α(z)$, with $α$ a map in the appropriate category. In the present paper, we consider two different unitality conditions for hom-associative algebras. The first one, existence of a unit in the classical sense, is stronger than the second one, which we call weak unitality. We show associativity conditions connected to the size of the image of the twisting map for unital hom-associative algebras. Also the problem of embedding arbitrary hom-associative algebras into unital or weakly unital ones is investigated. Finally, we show that weakly unital hom-associative algebras with bijective twisting map are twisted versions of associative algebras.

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