(11steps total) PrintForm Definitions LogicSupplement Sections DiscrMathExt Doc
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At: xor vs neg n dec 1 2 1

1. P : Prop
2. Q : Prop
3. Q  P
4. Q  (P)
5. Dec(P)
  P  P


By: (-1) Def


Generated subgoals:

None

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

(11steps total) PrintForm Definitions LogicSupplement Sections DiscrMathExt Doc