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Theorem jarl 592
Description: Elimination of a nested antecedent. (Contributed by Wolf Lammen, 10-May-2013.)
Assertion
Ref Expression
jarl (((𝜑𝜓) → 𝜒) → (¬ 𝜑𝜒))

Proof of Theorem jarl
StepHypRef Expression
1 pm2.21 555 . 2 𝜑 → (𝜑𝜓))
21imim1i 58 1 (((𝜑𝜓) → 𝜒) → (¬ 𝜑𝜒))
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 553
This theorem is referenced by:  pm2.68dc  802
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