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Theorem jarl 155
Description: Elimination of a nested antecedent as a kind of reversal of inference ja 153. (Contributed by Wolf Lammen, 10-May-2013.)
Assertion
Ref Expression
jarl  |-  ( ( ( ph  ->  ps )  ->  ch )  -> 
( -.  ph  ->  ch ) )

Proof of Theorem jarl
StepHypRef Expression
1 pm2.21 100 . 2  |-  ( -. 
ph  ->  ( ph  ->  ps ) )
21imim1i 54 1  |-  ( ( ( ph  ->  ps )  ->  ch )  -> 
( -.  ph  ->  ch ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4
This theorem is referenced by:  pm2.68  399  merco2  1491
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
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