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Theorem pm2.24 551
Description: Theorem *2.24 of [WhiteheadRussell] p. 104. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.24 (𝜑 → (¬ 𝜑𝜓))

Proof of Theorem pm2.24
StepHypRef Expression
1 pm2.21 547 . 2 𝜑 → (𝜑𝜓))
21com12 27 1 (𝜑 → (¬ 𝜑𝜓))
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-in2 545
This theorem is referenced by:  pm2.24d  552  pm2.53  641  pm2.82  725  pm4.81dc  814  dedlema  876  alexim  1536  sotritric  4058  ltxrlt  7065  zltnle  8263  elfzonlteqm1  9033
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