On the aperiodic avoidability of binary patterns with variables and reversals
نویسندگان
چکیده
منابع مشابه
A note on the avoidability of binary patterns with variables and reversals
In this note we present a characterisation of all unary and binary patterns that do not only contain variables, but also reversals of their instances. These types of variables were studied recently in either more general or particular cases. We show that the results are not surprising at all in the general case, and extend the avoidability of these patterns to enforce aperiodic words.
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For every pattern p over the alphabet {x, y, x, y}, we specify the least k such that p is k-avoidable.
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Computing the partial word avoidability indices of binary patterns
We complete the classification of binary patterns in partial words that was started in earlier publications by proving that the partial word avoidability index of the binary pattern ABABA is two and the one of the binary pattern ABBA is three.
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ژورنال
عنوان ژورنال: Theoretical Computer Science
سال: 2017
ISSN: 0304-3975
DOI: 10.1016/j.tcs.2016.12.022