(12steps total) PrintForm Definitions LogicSupplement Sections DiscrMathExt Doc
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At: negnegelim vs bivalence 1
1. P:Prop. P  P
2. P : Prop
  P  P
By: BackThru: Hyp:-2

Generated subgoal:

1   (P  P)
6 steps

About:
propimpliesorall
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(12steps total) PrintForm Definitions LogicSupplement Sections DiscrMathExt Doc