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- Iso_U(A,B) :=
- sigma f : A -> B .
- sigma g : B -> A .
- (pi a : A . Iso_A(g f a, a)) *
- (pi b : B . Iso_B(f g b, b))
- Equiv_U(A,B) :=
- sigma f : A -> B .
- pi y : B .
- sigma x : (Fib f y) .
- pi x' : (Fib f y) .
- Iso_(Fib f y)(x,x')
- Fib f y :=
- sigma x : A.
- Iso_B(f x, y)
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