(7steps total) PfGloss PrintForm Definitions LogicSupplement Sections DiscrMathExt Search Doc
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
No proposition is equivalent to its own negation.

At: no prop iff its neg

  P:Prop. (P  P)
By: 2 Times Analyze

Generated subgoal:

1 1. P : Prop
2. P  P
  False
6 steps

About:
propfalseall
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html

(7steps total) PfGloss PrintForm Definitions LogicSupplement Sections DiscrMathExt Search Doc