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Theorem bitr 708
Description: Theorem *4.22 of [WhiteheadRussell] p. 117. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
bitr

Proof of Theorem bitr
StepHypRef Expression
1 bibi1 327 . 2
21biimpar 485 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  <->wb 184  /\wa 369
This theorem is referenced by:  opelopabt  4764  domunfican  7813  albitr  31268  3orbi123VD  33650  e2ebindALT  33729
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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