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Theorem pm4.43 927
Description: Theorem *4.43 of [WhiteheadRussell] p. 119. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 26-Nov-2012.)
Assertion
Ref Expression
pm4.43

Proof of Theorem pm4.43
StepHypRef Expression
1 pm3.24 882 . . 3
21biorfi 407 . 2
3 ordi 864 . 2
42, 3bitri 249 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184  \/wo 368  /\wa 369
This theorem is referenced by:  stoweidlem26  31808
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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