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Theorem pm2.67-2 703
Description: Slight generalization of Theorem *2.67 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.) (Revised by NM, 9-Dec-2012.)
Assertion
Ref Expression
pm2.67-2 (((𝜑𝜒) → 𝜓) → (𝜑𝜓))

Proof of Theorem pm2.67-2
StepHypRef Expression
1 orc 702 . 2 (𝜑 → (𝜑𝜒))
21imim1i 60 1 (((𝜑𝜒) → 𝜓) → (𝜑𝜓))
Colors of variables: wff set class
Syntax hints:  wi 4  wo 698
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-io 699
This theorem depends on definitions:  df-bi 116
This theorem is referenced by:  oibabs  704  pm2.67  733
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