Abstract
For a given language L, we study the languages X such that for all distinct words \(u, v \in L\), there exists a word \(x \in X\) appearing a different number of times as a factor in u and in v. In particular, we are interested in the following question: For which languages L does there exist a finite language X satisfying the above condition? We answer this question for all regular languages and for all sets of factors of infinite words.
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Saarela, A. (2019). Separating Many Words by Counting Occurrences of Factors. In: Hofman, P., Skrzypczak, M. (eds) Developments in Language Theory. DLT 2019. Lecture Notes in Computer Science(), vol 11647. Springer, Cham. https://doi.org/10.1007/978-3-030-24886-4_19
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