对合匹配、保向和反向映射半群及全变换半群的逆覆盖
Involution matchings, the semigroup of orientation-preserving and orientation-reversing mappings, and inverse covers of the full transformation semigroup
摘要:
我们继续研究置换的有限正则半群,每个元素映射到它的逆之一,提供了一个完整的描述的情况下,半群的幂等元生成的子半群是一个联盟的群体。我们展示了,在两种方式,如何构建一个对合匹配的半群上的所有变换,无论是保持或反转方向的有限周期。最后,作为应用,证明了有限全变换半群不被交闭的逆半群覆盖。
英文摘要:
We continue the study of permutations of a finite regular semigroup that map each element to one of its inverses, providing a complete description in the case of semigroups whose idempotent generated subsemigroup is a union of groups. We show, in two ways, how to construct an involution matching on the semigroup of all transformations which either preserve or reverse orientation of a finite cycle. Finally, by way of application, we prove that finite full transformation semigroups have no cover by inverse semigroups that is closed under intersection.
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