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Theorem syl3an1b 1252
Description: A syllogism inference. (Contributed by NM, 22-Aug-1995.)
Hypotheses
Ref Expression
syl3an1b.1  |-  ( ph  <->  ps )
syl3an1b.2  |-  ( ( ps  /\  ch  /\  th )  ->  ta )
Assertion
Ref Expression
syl3an1b  |-  ( (
ph  /\  ch  /\  th )  ->  ta )

Proof of Theorem syl3an1b
StepHypRef Expression
1 syl3an1b.1 . . 3  |-  ( ph  <->  ps )
21biimpi 119 . 2  |-  ( ph  ->  ps )
3 syl3an1b.2 . 2  |-  ( ( ps  /\  ch  /\  th )  ->  ta )
42, 3syl3an1 1249 1  |-  ( (
ph  /\  ch  /\  th )  ->  ta )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 104    /\ w3a 962
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107
This theorem depends on definitions:  df-bi 116  df-3an 964
This theorem is referenced by:  ovmpoelrn  6098  irrmul  9432  xrlttr  9574
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