Let assume that I have the following two automata A1 and A2 :
I have to do the intersection of the two, so I did this :
My question is related to the "∅". If I have two incomplete automata without dead states, and given a specific state, one automaton has a transition for one symbol but the second doesn't have it, what should I do ? For example I am in the state 13 in the transition table and I read "b", should I rather put ∅ or 4 and make it non final ?