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Theorem 3expd 1156
Description: Exportation deduction for triple conjunction. (Contributed by NM, 26-Oct-2006.)
Hypothesis
Ref Expression
3expd.1  |-  ( ph  ->  ( ( ps  /\  ch  /\  th )  ->  ta ) )
Assertion
Ref Expression
3expd  |-  ( ph  ->  ( ps  ->  ( ch  ->  ( th  ->  ta ) ) ) )

Proof of Theorem 3expd
StepHypRef Expression
1 3expd.1 . . . 4  |-  ( ph  ->  ( ( ps  /\  ch  /\  th )  ->  ta ) )
21com12 30 . . 3  |-  ( ( ps  /\  ch  /\  th )  ->  ( ph  ->  ta ) )
323exp 1138 . 2  |-  ( ps 
->  ( ch  ->  ( th  ->  ( ph  ->  ta ) ) ) )
43com4r 85 1  |-  ( ph  ->  ( ps  ->  ( ch  ->  ( th  ->  ta ) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ w3a 920
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106
This theorem depends on definitions:  df-bi 115  df-3an 922
This theorem is referenced by:  3exp2  1157  exp516  1159  3impexp  1367  3impexpbicom  1368
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