1. B : Type
2. A : Type
3. C : Type
4. g : AB 5. f : BC 6. a1,a2:A. g(a1) = g(a2) a1 = a2 7. b1,b2:B. f(b1) = f(b2) b1 = b2 8. a1 : A 9. a2 : A 10. (f o g)(a1) = (f o g)(a2)
a1 = a2
3 steps
About:
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html