in Theory of Computation
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What can be said about a regular language $L$ over $\{ a \}$ whose minimal finite state automaton has two states?

  1. $L$ must be $\{a^n \mid n \  \text{ is odd}\}$
  2. $L$ must be $\{a^n \mid n \  \text{ is even}\}$
  3. $L$ must be $\{a^n \mid n \geq 0\}$
  4. Either $L$ must be $\{a^n \mid n \text{ is odd}\}$, or $L$ must be $\{a^n \mid n \text{ is even}\}$
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