NFE Home New Foundations Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  NFE Home  >  Th. List  >  pm5.11 GIF version

Theorem pm5.11 854
Description: Theorem *5.11 of [WhiteheadRussell] p. 123. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm5.11 ((φψ) φψ))

Proof of Theorem pm5.11
StepHypRef Expression
1 pm2.5 144 . 2 (¬ (φψ) → (¬ φψ))
21orri 365 1 ((φψ) φψ))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   wo 357
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177  df-or 359
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator