At: surj is inj gen 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1. A: Type
2. B: Type
3. f: A
B
4. f1: AB
5. g: BA
6. InvFuns(A; B; f1; g)
7. n: 
8. f2: nB
9. g1: Bn
10. g1 o f2 = Id
11. f2 o g1 = Id
12. b: n
13. a: A
14. f(a) = f2(b)
(g1 o f o g o f2 o g1 o f1)(a) = b
By:
RWH (HypC 11) 0
THEN
Reduce 0
Generated subgoal:| 1 | g1(f(g(f1(a)))) = b |
About:
