Abstract
We define the geometrical closure of a language over a \(j\)-ary alphabet, and we prove that in the case of dimension 2 the family \(V_{3/2}\) in the Straubing-Thérien hierarchy of languages is closed under this operation. In other words, the geometrical closure of a \(V_{3/2}\) binary language is still a \(V_{3/2}\) language. This is achieved by carrying out some transformations over a regular expression representing the \(V_{3/2}\) language, which leads to a \(V_{3/2}\) regular expression for the geometrical closure.
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Dubernard, JP., Guaiana, G., Mignot, L. (2019). Geometrical Closure of Binary \(V_{3/2}\) Languages. In: Martín-Vide, C., Okhotin, A., Shapira, D. (eds) Language and Automata Theory and Applications. LATA 2019. Lecture Notes in Computer Science(), vol 11417. Springer, Cham. https://doi.org/10.1007/978-3-030-13435-8_22
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