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Theorem pm4.45 669
Description: Theorem *4.45 of [WhiteheadRussell] p. 119. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.45

Proof of Theorem pm4.45
StepHypRef Expression
1 orc 374 . 2
21pm4.71i 613 1
Colors of variables: wff setvar class
Syntax hints:   wb 176   wo 357   wa 358
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360
This theorem is referenced by:  dn1  932
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