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Theorem pm2.46 412
Description: Theorem *2.46 of [WhiteheadRussell] p. 106. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.46 (¬ (𝜑𝜓) → ¬ 𝜓)

Proof of Theorem pm2.46
StepHypRef Expression
1 olc 398 . 2 (𝜓 → (𝜑𝜓))
21con3i 149 1 (¬ (𝜑𝜓) → ¬ 𝜓)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wo 382
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 196  df-or 384
This theorem is referenced by:  pm2.48  414  pm2.49  415  rb-ax3  1670  eueq3  3348  ltnsym  10014  tglineneq  25339  unbdqndv2lem1  31670  nnfoctbdjlem  39348
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