On the square root of languages

被引：0

作者：

Bertoni, A ^{[1
]}

Massazza, P ^{[1
]}

机构：

[1] Univ Milan, Dipartimento Sci Informaz, I-20135 Milan, Italy

来源：

FORMAL POWER SERIES AND ALGEBRAIC COMBINATORICS | 2000年

关键词：

D O I：

暂无

中图分类号：

O29 [应用数学];

学科分类号：

070104 ;

摘要：

The unambiguous square root of a language L subset of or equal to Sigma* is a language X s.t. X-2 = L and the product is unambiguous. We prove that: 1. Every language admits at most one unambiguous square root 2. For the class of regular languages, it is decidable whether the unambiguous square root is regular; the same problem becomes undecidable for the class of context-free languages 3. The unambiguous square root of a language in P is in P.

引用

页码：125 / 134

页数：10

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