Permutations of context-free and indexed languages

Published 17 Dec 2014 in cs.FL | (1412.5512v2)

Abstract: We consider the cyclic closure of a language, and its generalisation to the operators $C^k$ introduced by Brandst\"adt. We prove that the cyclic closure of an indexed language is indexed, and that if $L$ is a context-free language then $C^k(L)$ is indexed.

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