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Theorem merco1lem7 1477
Description: Used to rederive the Tarski-Bernays-Wajsberg axioms from merco1 1468. (Contributed by Anthony Hart, 17-Sep-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
merco1lem7  |-  ( ph  ->  ( ( ( ps 
->  ch )  ->  ps )  ->  ps ) )

Proof of Theorem merco1lem7
StepHypRef Expression
1 merco1lem5 1475 . . 3  |-  ( ( ( ( ps  ->  F.  )  ->  ( (
( ps  ->  ch )  ->  ps )  ->  F.  ) )  ->  ch )  ->  ( ps  ->  ch ) )
2 merco1 1468 . . 3  |-  ( ( ( ( ( ps 
->  F.  )  ->  (
( ( ps  ->  ch )  ->  ps )  ->  F.  ) )  ->  ch )  ->  ( ps 
->  ch ) )  -> 
( ( ( ps 
->  ch )  ->  ps )  ->  ( ( ( ps  ->  ch )  ->  ps )  ->  ps ) ) )
31, 2ax-mp 8 . 2  |-  ( ( ( ps  ->  ch )  ->  ps )  -> 
( ( ( ps 
->  ch )  ->  ps )  ->  ps ) )
4 merco1lem6 1476 . 2  |-  ( ( ( ( ps  ->  ch )  ->  ps )  ->  ( ( ( ps 
->  ch )  ->  ps )  ->  ps ) )  ->  ( ph  ->  ( ( ( ps  ->  ch )  ->  ps )  ->  ps ) ) )
53, 4ax-mp 8 1  |-  ( ph  ->  ( ( ( ps 
->  ch )  ->  ps )  ->  ps ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    F. wfal 1308
This theorem is referenced by:  retbwax3  1478  merco1lem17  1488
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177  df-tru 1310  df-fal 1311
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