IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
negnegelim imp notfin imp unb inf12111 1. P:Prop. PP 2. A : Type
3. (n:. A ~ n)
4. k : 5. 0<k 6. f : (k-1)A 7. Inj((k-1); A; f) [not for witness]
8. (a:A. i:(k-1). f(i) a)
n:. A ~ n
By:
FwdThru: Thm*(x:T. Q(x)) (x:T. Q(x)) on [ Hyp:-1 ] THEN Witness: k-1