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Theorem pm2.83 77
Description: Theorem *2.83 of [WhiteheadRussell] p. 108. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.83

Proof of Theorem pm2.83
StepHypRef Expression
1 imim1 76 . 2
21imim3i 59 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4
This theorem is referenced by:  rexrsb  32174
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7
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