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Theorem syl6an 1323
Description: A syllogism deduction combined with conjoining antecedents. (Contributed by Alan Sare, 28-Oct-2011.)
Hypotheses
Ref Expression
syl6an.1 (𝜑𝜓)
syl6an.2 (𝜑 → (𝜒𝜃))
syl6an.3 ((𝜓𝜃) → 𝜏)
Assertion
Ref Expression
syl6an (𝜑 → (𝜒𝜏))

Proof of Theorem syl6an
StepHypRef Expression
1 syl6an.2 . . 3 (𝜑 → (𝜒𝜃))
2 syl6an.1 . . 3 (𝜑𝜓)
31, 2jctild 299 . 2 (𝜑 → (𝜒 → (𝜓𝜃)))
4 syl6an.3 . 2 ((𝜓𝜃) → 𝜏)
53, 4syl6 29 1 (𝜑 → (𝜒𝜏))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 97
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia3 101
This theorem is referenced by:  rdgon  5973  prarloclem5  6598  ltsopr  6694  nominpos  8162  ublbneg  8548  absle  9685  climshftlemg  9823  serif0  9871  bj-indind  10056
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