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Theorem pm3.14 976
Description: Theorem *3.14 of [WhiteheadRussell] p. 111. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm3.14 ((¬ 𝜑 ∨ ¬ 𝜓) → ¬ (𝜑𝜓))

Proof of Theorem pm3.14
StepHypRef Expression
1 pm3.1 972 . 2 ((𝜑𝜓) → ¬ (¬ 𝜑 ∨ ¬ 𝜓))
21con2i 136 1 ((¬ 𝜑 ∨ ¬ 𝜓) → ¬ (𝜑𝜓))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 382  wo 834
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 197  df-an 383  df-or 835
This theorem is referenced by:  naim1  32721  naim2  32722  finxpreclem2  33564  tsan2  34281  tsan3  34282  ntrneiel2  38910  onenotinotbothi  41620  twonotinotbothi  41621
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