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Theorem pm2.24d 135
Description: Deduction version of pm2.24 101. (Contributed by NM, 30-Jan-2006.)
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 . . 3 (φψ)
21a1d 22 . 2 (φ → (¬ χψ))
32con1d 116 1 (φ → (¬ ψχ))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem is referenced by:  pm2.5  144  xpexr  5109
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