IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
card st vs msize a:, P:(aProp), f:(a2).
(i:a. P(i) f(i) = 1 2) ({x:a| P(x) } ~ (Msize(f)))
By:
Def of Msize(<nat>) THEN Reduce Concl
THEN
Rewrite by Thm*a:, b:(a). (i:ab(i)) ~ ( i:a. b(i))