At: empty lang dec 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1
1. Alph: Type
2. St: Type
3. Auto: Automata(Alph;St)
4. Fin(Alph)
5. n: 
6. f:
n
St
7. g: St

n
8. InvFuns(
n; St; f; g)
9. l: Alph*
10. FinalState(Auto)((Action(Auto):l
InitialState(Auto)))
InvFuns(St;
n; g; f)
By: BackThru Thm*
f:(A
B), g:(B
A). InvFuns(A; B; f; g) 
InvFuns(B; A; g; f)
Generated subgoals:None
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