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Theorem orim2 841
Description: Axiom *1.6 (Sum) of [WhiteheadRussell] p. 97. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
orim2

Proof of Theorem orim2
StepHypRef Expression
1 id 22 . 2
21orim2d 840 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  \/wo 368
This theorem is referenced by:  pm2.81  851  rb-ax1  1585
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 185  df-or 370  df-an 371
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