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Theorem syl112anc 1186
Description: Syllogism combined with contraction. (Contributed by NM, 11-Mar-2012.)
Hypotheses
Ref Expression
sylXanc.1 (φψ)
sylXanc.2 (φχ)
sylXanc.3 (φθ)
sylXanc.4 (φτ)
syl112anc.5 ((ψ χ (θ τ)) → η)
Assertion
Ref Expression
syl112anc (φη)

Proof of Theorem syl112anc
StepHypRef Expression
1 sylXanc.1 . 2 (φψ)
2 sylXanc.2 . 2 (φχ)
3 sylXanc.3 . . 3 (φθ)
4 sylXanc.4 . . 3 (φτ)
53, 4jca 518 . 2 (φ → (θ τ))
6 syl112anc.5 . 2 ((ψ χ (θ τ)) → η)
71, 2, 5, 6syl3anc 1182 1 (φη)
Colors of variables: wff setvar class
Syntax hints:  wi 4   wa 358   w3a 934
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177  df-an 360  df-3an 936
This theorem is referenced by: (None)
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