On Aperiodic Relational Morphisms

On Aperiodic Relational Morphisms
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论非周期关系态射

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发表时间:
2005
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通讯作者:
B. Steinberg
B. Steinberg
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作者:
B. Steinberg

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摘要 我们刻画了非周期关系态射为正则上的内射 $H$-类。这个结果被应用于McAlister关于连接的结果的简单证明和推广。 非周期半群和群此外,我们还证明了,如果$pv H$是一个真的,非平凡的伪簇群,那么[pv Aast pv Hsubsetneq(pv Aast pv G)cap ov {pv H}.]我们提供坐标自由配方和证明罗兹的介绍引理和推广。作为应用,我们给出了Tilson关于半群复杂性定理的简单证明 最多有2个非零的J类,并且罗兹定理表明复杂性不是局部的。
Abstract We characterize aperiodic relational morphisms as those that are injective on regular $H$-classes. This result is applied to obtain simple proofs and generalizations of McAlister’s results on joins of aperiodic semigroups and groups. Also, we show that if $pv H$ is a proper, non-trivial pseudovariety of groups, then [pv Aast pv Hsubsetneq (pv Aast pv G)cap ov {pv H}.] We provide coordinate-free formulations and proofs of Rhodes’s Presentation Lemma and generalizations. As an application, we give simpler proofs of Tilson’s theorem on the complexity of semigroups with at most $2$ non-zero $J$-classes and Rhodes’s theorem that complexity is not local.