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At: Rl quo is decidable 1 1
1. Alph: Type
2. St: Type
3. Auto: Automata(Alph;St)
4. Fin(Alph) & Fin(St)
5. x: Alph*
6. y: Alph*
7. Fin(x,y:Alph*//(x LangOf(Auto)-induced Equiv y))

Dec(x = y x,y:Alph*//(x LangOf(Auto)-induced Equiv y))
By:
Unfold `finite` 7
THEN
Analyze 7
Generated subgoal:

17. n:
8. f:(n(x,y:Alph*//(x LangOf(Auto)-induced Equiv y))). Bij(n; x,y:Alph*//(x LangOf(Auto)-induced Equiv y); f)
Dec(x = y x,y:Alph*//(x LangOf(Auto)-induced Equiv y))

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