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Theorem pm2.36 778
Description: Theorem *2.36 of [WhiteheadRussell] p. 105. (Contributed by NM, 6-Mar-2008.)
Assertion
Ref Expression
pm2.36 ((𝜓𝜒) → ((𝜑𝜓) → (𝜒𝜑)))

Proof of Theorem pm2.36
StepHypRef Expression
1 pm1.4 701 . 2 ((𝜑𝜓) → (𝜓𝜑))
2 pm2.38 777 . 2 ((𝜓𝜒) → ((𝜓𝜑) → (𝜒𝜑)))
31, 2syl5 32 1 ((𝜓𝜒) → ((𝜑𝜓) → (𝜒𝜑)))
Colors of variables: wff set class
Syntax hints:  wi 4  wo 682
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 683
This theorem depends on definitions:  df-bi 116
This theorem is referenced by:  stdcndc  815
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