Some nil-ai-semiring varieties

Pub Date : 2024-02-14 DOI:10.1007/s00233-024-10411-3
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Abstract

We study some nil-ai-semiring varieties. We establish a model for the free object in the variety \(\textbf{FC}\) generated by all commutative flat semirings. Also, we provide two sufficient conditions under which a finite ai-semiring is nonfinitely based. As a consequence, we show that the power semiring \(P_{\scriptstyle {\dot{S}}_{c}(W)}\) of the finite nil-semigroup \({\dot{S}}_{c}(W)\) is nonfinitely based, where W is a finite set of words in the free commutative semigroup \(X_{c}^{+}\) over an alphabet X, whenever the maximum of lengths of words in W is \(k\ge 3\) and W does not contain the kth power of a letter. This partially answers a problem raised by Jackson et al. (J Algebr 611: 211–245, 2022).

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一些无爱音节变体
摘要 我们研究了一些 nil-ai-semiring varieties。我们为所有交换平半音生成的 \(\textbf{FC}\) 中的自由客体建立了一个模型。同时,我们还提供了有限ai-semiring是非无限基础的两个充分条件。因此,我们证明了有限 nil semigroup \({\dot{S}}_{c}(W)}\) 的 power semiring \(P_{\scriptstyle {\dot{S}}_{c}(W)}\) 是非无限基于的、其中,W 是字母表 X 上自由交换半群 \(X_{c}^{+}\)中单词的有限集合,只要 W 中单词长度的最大值是 \(k\ge 3\),并且 W 不包含字母的第 k 次幂。这部分回答了杰克逊等人提出的一个问题(J Algebr 611: 211-245, 2022)。
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