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arXiv 1906.06174math.CO
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生成反回文词的态射

Morphisms generating antipalindromic words

Petr Ambrož, Zuzana Masáková, Edita Pelantová

摘要:

本文引入了字母表$A=\{0,1\}$上的两类态射,它们的不动点包含无穷多个反回文因子.反回文是在反态$\mathrm{E}:\{0,1\}^*\to\{0,1\}^*$作用下的有限字不变量,定义为$\mathrm{E}(w_1\cdots w_n)=(1-w_{n})\cdots(1-w_1)$。我们猜想,这两个类包含所有态射(共轭)产生无限的话,无限多的反回文。这是一个类似于著名的HKS猜想关于无限的话包含无限多回文。我们证明了我们对两类特殊态射的猜想,即(i)一致态射和(ii)具有包含无穷多个回文的不动点的态射。

英文摘要:

We introduce two classes of morphisms over the alphabet $A=\{0,1\}$ whose fixed points contain infinitely many antipalindromic factors. An antipalindrome is a finite word invariant under the action of the antimorphism $\mathrm{E}:\{0,1\}^*\to\{0,1\}^*$, defined by $\mathrm{E}(w_1\cdots w_n)=(1-w_{n})\cdots(1-w_1)$. We conjecture that these two classes contain all morphisms (up to conjugation) which generate infinite words with infinitely many antipalindromes. This is an analogue to the famous HKS conjecture concerning infinite words containing infinitely many palindromes. We prove our conjecture for two special classes of morphisms, namely (i) uniform morphisms and (ii) morphisms with fixed points containing also infinitely many palindromes.

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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