A framework to study commutation problems

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Two problems on commutation of languages

We survey the known results on two old open problems on commutation of languages. The first problem, raised by Conway in 1971, is asking if the centralizer of a rational language must be rational as well – the centralizer of a language is the largest set of words commuting with that language. The second problem, proposed by Ratoandromanana in 1989, is asking for a characterization of those lang...

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ژورنال

عنوان ژورنال: Bulletin de la Société mathématique de France

سال: 1978

ISSN: 0037-9484,2102-622X

DOI: 10.24033/bsmf.1874