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Theorem pm5.42 548
Description: Theorem *5.42 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm5.42

Proof of Theorem pm5.42
StepHypRef Expression
1 ibar 504 . . 3
21imbi2d 316 . 2
32pm5.74i 245 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  <->wb 184  /\wa 369
This theorem is referenced by:  anc2l  555  imdistan  689
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-an 371
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