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8. g : A'A 9. F : x:AB(x)B'(f(x)) 10. G : x:AB'(f(x))B(x) 11. InvFuns(A;A';f;g) 12. u:A. InvFuns(B(u);B'(f(u));F(u);G(u)) 13. f1 : A'A'' 14. g1 : A''A' 15. F1 : x':A'B'(x')B''(f1(x')) 16. G1 : x':A'B''(f1(x'))B'(x') 17. InvFuns(A';A'';f1;g1) 18. u:A'. InvFuns(B'(u);B''(f1(u));F1(u);G1(u)) (x:A. B(x)) ~ (x'':A''. B''(x'')) | 9 steps |
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