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arXiv 1604.01014math.GR
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带的次幂隶属度问题

The subpower membership problem for bands

Markus Steindl

摘要:

固定一个有限半群$S$,设$a_1,\ldots,a_k, b$是直幂$S^n$中的元组. $S$的次幂成员问题(SMP)询问$b$是否可以由$a_1,\ldots,a_k$生成。对于带(幂等半群),我们给出了一个二分法:若带$S$属于某个拟簇,则$SMP(S)$在P中,否则它是NP-完全的.此外,我们确定了最大的各种乐队的有限成员诱导一个听话的SMP。最后,我们提出了第一个例子,两个有限代数,产生相同的品种,并有听话和NP-完全SMP,分别。

英文摘要:

Fix a finite semigroup $S$ and let $a_1,\ldots,a_k, b$ be tuples in a direct power $S^n$. The subpower membership problem (SMP) for $S$ asks whether $b$ can be generated by $a_1,\ldots,a_k$. For bands (idempotent semigroups), we provide a dichotomy result: if a band $S$ belongs to a certain quasivariety, then $SMP(S)$ is in P; otherwise it is NP-complete. Furthermore we determine the greatest variety of bands all of whose finite members induce a tractable SMP. Finally we present the first example of two finite algebras that generate the same variety and have tractable and NP-complete SMPs, respectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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