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Theorem e32 28847
Description: A virtual deduction elimination rule. (Contributed by Alan Sare, 12-Jun-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypotheses
Ref Expression
e32.1  |-  (. ph ,. ps ,. ch  ->.  th ).
e32.2  |-  (. ph ,. ps  ->.  ta ).
e32.3  |-  ( th 
->  ( ta  ->  et ) )
Assertion
Ref Expression
e32  |-  (. ph ,. ps ,. ch  ->.  et ).

Proof of Theorem e32
StepHypRef Expression
1 e32.1 . 2  |-  (. ph ,. ps ,. ch  ->.  th ).
2 e32.2 . . 3  |-  (. ph ,. ps  ->.  ta ).
32vd23 28679 . 2  |-  (. ph ,. ps ,. ch  ->.  ta ).
4 e32.3 . 2  |-  ( th 
->  ( ta  ->  et ) )
51, 3, 4e33 28823 1  |-  (. ph ,. ps ,. ch  ->.  et ).
Colors of variables: wff set class
Syntax hints:    -> wi 4   (.wvd2 28645   (.wvd3 28655
This theorem is referenced by:  e32an  28849  exbirVD  28945  exbiriVD  28946  ssralv2VD  28958  trintALTVD  28972
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-an 360  df-3an 936  df-vd2 28646  df-vd3 28658
  Copyright terms: Public domain W3C validator