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At:
one one corr fams sym1112 1. A : Type
2. A' : Type
3. B : AType
4. B' : A'Type
5. f : AA' 6. g : A'A 7. F : x:AB(x)B'(f(x))
8. G : x:AB'(f(x))B(x)
9. InvFuns(A;A';f;g)
10. u:A. InvFuns(B(u);B'(f(u));F(u);G(u))
11. G o gx':A'B'(x')B(g(x'))
F o gx':A'B(g(x'))B'(x')