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Theorem pm2.24d 552
Description: Deduction version of pm2.24 551. (Contributed by NM, 30-Jan-2006.) (Revised by Mario Carneiro, 31-Jan-2015.)
Hypothesis
Ref Expression
pm2.24d.1 (φψ)
Assertion
Ref Expression
pm2.24d (φ → (¬ ψχ))

Proof of Theorem pm2.24d
StepHypRef Expression
1 pm2.24d.1 . 2 (φψ)
2 pm2.24 551 . 2 (ψ → (¬ ψχ))
31, 2syl 14 1 (φ → (¬ ψχ))
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:  pm2.52  581  pm2.5dc  762  reldmtpos  5809
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