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Questions about properties of the class of regular languages and individual languages.

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...where $s$ is a substitution that replaces each symbol of each string in $L$ with a regular expression. For example, if $L=a^*b$ and $s(a) =ab, s(b) = b^*$, we have $s(L) = (ab)^*b^*$. My thought …
asked Sep 29 '18 by GohanBlanco