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Theorem pm4.44 577
Description: Theorem *4.44 of [WhiteheadRussell] p. 119. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.44

Proof of Theorem pm4.44
StepHypRef Expression
1 orc 385 . 2
2 id 22 . . 3
3 simpl 457 . . 3
42, 3jaoi 379 . 2
51, 4impbii 188 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184  \/wo 368  /\wa 369
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371
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