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Theorem pm2.6 162
Description: Theorem *2.6 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.6

Proof of Theorem pm2.6
StepHypRef Expression
1 id 19 . 2
2 idd 21 . 2
31, 2jad 154 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem is referenced by:  pm2.61  163
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