IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
dec iff ex bvfun111111 1. T : Type
2. E : TTProp
3. g : x:Ty:T. E(x,y) E(x,y)
4. x : T 5. y : T 6. y1 : y:TE(x,y) E(x,y)
7. y1 = g(x)
8. x1 : E(x,y)
9. inl(x1) = y1(y)
InjCase(g(x,y); a. true; b. false) E(x,y)