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arXiv 1803.02604math.GR
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关于有限链的部分压缩半群

On certain semigroups of partial contractions of a finite chain

A. Umar, M. M. Zubairu

摘要:

设$[n]=\{1,2,\ldots,n\}$是有限链,$\mathcal{P}_{n}$是$[n]$上的部分变换半群.设$\mathcal{CP}_{n}=\{α\in \mathcal{P}_{n}: (for ~all~x,y\in Dom~α)~|xα-yα|\leq|x-y|\}$是$[n]$上部分压缩映射的子半群.证明了半群$\mathcal{CP}_{n}$及其某些子半群对所有$n$都是非正则左富足半群,但对$n\geq 4$不是右富足半群.

英文摘要:

Let $[n]=\{1,2,\ldots,n\}$ be a finite chain and let $\mathcal{P}_{n}$ be the semigroup of partial transformations on $[n]$. Let $\mathcal{CP}_{n}=\{α\in \mathcal{P}_{n}: (for ~all~x,y\in Dom~α)~|xα-yα|\leq|x-y|\}$ be the subsemigroup of partial contraction mappings on $[n]$. We have shown that the semigroup $\mathcal{CP}_{n}$ and some of its subsemigroups are nonregular left abundant semigroups for all $n$ but not right abundant for $n\geq 4$.

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