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On the Height of Towers of Subsequences and Prefixes
[article]

2017
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arXiv
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pre-print

A tower is a sequence of words alternating between two languages in such a way that every word is a subsequence of the following word. The height of the tower is the number of words in the sequence. If there is no infinite tower (a tower of infinite height), then the height of all towers between the languages is bounded. We study upper and lower bounds on the height of maximal finite towers with respect to the size of the NFA (the DFA) representation of the languages. We show that the upper

arXiv:1705.02813v1
fatcat:crfldvntrzba3bacmy52oqqmz4