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Theorem orim2 882
Description: Axiom *1.6 (Sum) of [WhiteheadRussell] p. 97. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
orim2 ((𝜓𝜒) → ((𝜑𝜓) → (𝜑𝜒)))

Proof of Theorem orim2
StepHypRef Expression
1 id 22 . 2 ((𝜓𝜒) → (𝜓𝜒))
21orim2d 881 1 ((𝜓𝜒) → ((𝜑𝜓) → (𝜑𝜒)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 382
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385
This theorem is referenced by:  pm2.81  892  rb-ax1  1668
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