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Theorem imim12i 57
Description: Inference joining two implications. (Contributed by NM, 5-Aug-1993.) (Proof shortened by O'Cat, 29-Oct-2011.)
Hypotheses
Ref Expression
imim12i.1  |-  ( ph  ->  ps )
imim12i.2  |-  ( ch 
->  th )
Assertion
Ref Expression
imim12i  |-  ( ( ps  ->  ch )  ->  ( ph  ->  th )
)

Proof of Theorem imim12i
StepHypRef Expression
1 imim12i.1 . 2  |-  ( ph  ->  ps )
2 imim12i.2 . . 3  |-  ( ch 
->  th )
32imim2i 12 . 2  |-  ( ( ps  ->  ch )  ->  ( ps  ->  th )
)
41, 3syl5 32 1  |-  ( ( ps  ->  ch )  ->  ( ph  ->  th )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7
This theorem is referenced by:  imim1i  58  hbim  1453  19.38  1582  cbvexdh  1817  exmoeudc  1979  bj-bdfindis  10459
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