Question: Let ALLDF A = { A : A is a DFA and L ( A ) = Sigma } . Show that ALLDF A

Let ALLDF A ={A : A is a DFA and L(A)=\Sigma }. Show that
ALLDF A is decidable
is this correct
M 1= On input A(where A is a DFA and L(A)=\Sigma }
1. Mark the start state 0 of A
2. Mark any state that has a transition coming from a marked state.
3. Repeat step 2 until no new states are marked.
4. Check if all marked states are accepting states:
If every marked state is an accept state, accept.
If there is any marked state that is not an accept state, reject.

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