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Theorem pm2.24 551
Description: Theorem *2.24 of [WhiteheadRussell] p. 104. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.24

Proof of Theorem pm2.24
StepHypRef Expression
1 pm2.21 547 . 2
21com12 27 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-in2 545
This theorem is referenced by:  pm2.24d  552  pm2.53  640  pm2.82  724  pm4.81dc  813  dedlema  875  alexim  1533  sotritric  4052  ltxrlt  6862  zltnle  8047  elfzonlteqm1  8816
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