Problem Detail: I can’t think of an example of a non-regular language $L$ such that $L^*$ is regular. . Any help ?
Asked By : Altaïr
Answered By : R B
Define $L={a^nb^n|nin mathbb N}cup {a,b}$ It’s not hard to see that while $L$ is not regular, $L^*=Sigma^*$.
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