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Theorem pm4.55 494
Description: Theorem *4.55 of [WhiteheadRussell] p. 120. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm4.55

Proof of Theorem pm4.55
StepHypRef Expression
1 pm4.54 493 . . 3
21con2bii 332 . 2
32bicomi 202 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184  \/wo 368  /\wa 369
This theorem is referenced by:  chrelat2i  26238  hlrelat2  33898
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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