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  1. Let $A$ be an infinite regular language. Prove that $A$ can be split into two infinite disjoint regular subsets.
  2. Let $B$ and $D$ be two languages. Write $B\subseteqq D$ if $B\subseteq D$ and $D$ contains infinitely many strings that are not in $B.$ Show that if $B$ and $D$ are two regular languages where $B\subseteqq D,$ then we can find a regular language $C$ where $B\subseteqq C\subseteqq D.$
asked in Theory of Computation by Boss (40k points) | 8 views

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