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At: auto2 lemma 5 1 1 1 1 1 1 2 2 1 1 2 1 2 1 1 1
1. Alph: Type
2. n:
3. n1:
4. f: n1Alph
5. Bij(n1; Alph; f)
6. f:((nn1)(n1n)). Bij(nn1; (n1n); f)
7. f1: (nn1)(n1n)
8. g: (n1n)nn1
9. InvFuns(nn1; (n1n); f1; g)
10. b: Alph*
11. ||b|| = n
12. a: (n1n)
13. f o g(a) = (z:||b||. b[z]) nAlph
14. ((f o g(a))[||b||]) = b

((f o g(a))[n]) = b {l:(Alph*)| ||l|| = n }
By: RWH (HypC 11) 14
Generated subgoal:

114. ((f o g(a))[n]) = b
((f o g(a))[n]) = b {l:(Alph*)| ||l|| = n }

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