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Theorem pm2.04 76
Description: Swap antecedents. Theorem *2.04 of [WhiteheadRussell] p. 100. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 12-Sep-2012.)
Assertion
Ref Expression
pm2.04

Proof of Theorem pm2.04
StepHypRef Expression
1 id 19 . 2
21com23 72 1
Colors of variables: wff setvar class
Syntax hints:   wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7
This theorem is referenced by:  com34  77  com45  83  bi2.04  350  merco2  1501  ralcom3  2776
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