By Pál Dömösi,Masami Ito

A note is expounded to be primitive if it can't be represented as any energy of one other notice. it's a recognized conjecture that the set of all primitive phrases Q over a non-trivial alphabet isn't context-free: this conjecture continues to be open. during this ebook, the authors take care of homes of primitive phrases over a non-primitive alphabet, the language such as all primitive phrases and comparable languages. in addition, a few decidable and undecidable issues of recognize to the above languages are mentioned to boot. As one other test, a look for a non-phrase constitution grammar which generates Q is performed.

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Context-Free Languages and Primitive Words by Pál Dömösi,Masami Ito

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