SOLUTION-
ALLDFA = {(D| D is a DFA and L(D) = Σ*).
P is a class of language which are decidable in polynomial time on DFA.
We construct a Turing machine M that decides ALLDFA in a polynomial time
M = on input <D> where D is DFA
1. Construct DFA B that recognises L(D)' by swapping the accept and non accept states in DFA D.
2. Run the decider S of EDFA on input<B> now we can determine if this decider M runs in polynomial time.(Test weather a path exist from the satrt to each accept state in B).
3. If S accepts ,accept . If S rejects reject
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7.(15) Let PALINDROMEDFA = { <M> Mis a DFA, and for all s E L(M), s is a palindrome } Show that PALINDROMEDFA E P by providing an algorithm for it that runs in polynomial time.
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