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Theorem pm4.65r 782
Description: One direction of Theorem *4.65 of [WhiteheadRussell] p. 120. The converse holds in classical logic. (Contributed by Jim Kingdon, 28-Jul-2018.)
Ref Expression

Proof of Theorem pm4.65r
StepHypRef Expression
1 annimim 781 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wa 97
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-in1 544  ax-in2 545
This theorem is referenced by: (None)
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