(4steps total) PfGloss PrintForm DiscreteMath Sections DiscrMathExt Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At: fun with inv2 is surj 1 1
1. A : Type
2. B : Type
3. f : AB
4. g : BA
5. x:A. g(f(x)) = x
6. y:B. f(g(y)) = y
7. b : B
  a:A. f(a) = b
By: Witness: g(b)

Generated subgoal:

1   f(g(b)) = b
1 step

About:
applyfunctionuniverseequalallexists
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(4steps total) PfGloss PrintForm DiscreteMath Sections DiscrMathExt Doc