(17steps total) Remark PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At: nsub inj factorial tail 1 1 1 1
1. a : 
2. a1:. a1<a  (b:. (a1 inj b) ~ (b!a1))
3. b : 
4. ab
5. a = 0
  (a inj b) ~ 1
By: BackThru: Thm*  (A ~ 1)  (!A)

Generated subgoal:

1   !(a inj b)
3 steps

About:
intnatural_numberless_thanuniverseequalimpliesall
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

(17steps total) Remark PrintForm Definitions Lemmas DiscreteMath Sections DiscrMathExt Doc