It's a simple and maybe silly question. Does all unary language aka belongs to {1*} a P language. It seems I can always check the input unary string in linear time to see if there exists one in the language.
2026-03-30 06:15:36.1774851336
Does all unary language belongs to P questions?
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The answer is no. Take a non recursive subset $S$ of $\Bbb{N}$. Then the language $\{1^n \mid n \in S\}$ will not even be decidable.