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Theorem rbaibrOLD 916
Description: Obsolete proof of rbaibr 913 as of 19-Jan-2020. (Contributed by Mario Carneiro, 11-Sep-2015.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypothesis
Ref Expression
baib.1  |-  ( ph  <->  ( ps  /\  ch )
)
Assertion
Ref Expression
rbaibrOLD  |-  ( ch 
->  ( ps  <->  ph ) )

Proof of Theorem rbaibrOLD
StepHypRef Expression
1 baib.1 . . 3  |-  ( ph  <->  ( ps  /\  ch )
)
2 ancom 451 . . 3  |-  ( ( ps  /\  ch )  <->  ( ch  /\  ps )
)
31, 2bitri 252 . 2  |-  ( ph  <->  ( ch  /\  ps )
)
43baibr 912 1  |-  ( ch 
->  ( ps  <->  ph ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    <-> wb 187    /\ wa 370
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 188  df-an 372
This theorem is referenced by: (None)
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