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Theorem e002 28415
Description: A virtual deduction elimination rule. (Contributed by Alan Sare, 24-Jun-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypotheses
Ref Expression
e002.1  |-  ph
e002.2  |-  ps
e002.3  |-  (. ch ,. th  ->.  ta ).
e002.4  |-  ( ph  ->  ( ps  ->  ( ta  ->  et ) ) )
Assertion
Ref Expression
e002  |-  (. ch ,. th  ->.  et ).

Proof of Theorem e002
StepHypRef Expression
1 e002.1 . . 3  |-  ph
21vd02 28370 . 2  |-  (. ch ,. th  ->.  ph ).
3 e002.2 . . 3  |-  ps
43vd02 28370 . 2  |-  (. ch ,. th  ->.  ps ).
5 e002.3 . 2  |-  (. ch ,. th  ->.  ta ).
6 e002.4 . 2  |-  ( ph  ->  ( ps  ->  ( ta  ->  et ) ) )
72, 4, 5, 6e222 28408 1  |-  (. ch ,. th  ->.  et ).
Colors of variables: wff set class
Syntax hints:    -> wi 4   (.wvd2 28346
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-vd2 28347
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