IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
prime nat312a1 1. x :
2. 2x 3. (i:{2..x}. i | x)
4. b :
5. |b| | x (b ~ 1) (b ~ x)
By:
(Use:[b] Inst: Thm*a:. |a| ~ a THEN SimilarTo (|b| ~ 1) (|b| ~ x))
THEN
ChainRelation: Thm* EquivRel x,y:. x ~ y