On Regular Images of Regular Languages under Extended Word Operations
نویسندگان
چکیده
منابع مشابه
Operations preserving regular languages
Given a strictly increasing sequence s of non-negative integers, filtering a word a0a1 · · · an by s consists in deleting the letters ai such that i is not in the set {s0, s1, . . .}. By a natural generalization, denote by L[s], where L is a language, the set of all words of L filtered by s. The filtering problem is to characterize the filters s such that, for every regular language L, L[s] is ...
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ژورنال
عنوان ژورنال: Electronic Proceedings in Theoretical Computer Science
سال: 2017
ISSN: 2075-2180
DOI: 10.4204/eptcs.252.3