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Theorem syl31anc 1138
 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)
syl31anc.5 (((𝜓𝜒𝜃) ∧ 𝜏) → 𝜂)
Assertion
Ref Expression
syl31anc (𝜑𝜂)

Proof of Theorem syl31anc
StepHypRef Expression
1 sylXanc.1 . . 3 (𝜑𝜓)
2 sylXanc.2 . . 3 (𝜑𝜒)
3 sylXanc.3 . . 3 (𝜑𝜃)
41, 2, 33jca 1084 . 2 (𝜑 → (𝜓𝜒𝜃))
5 sylXanc.4 . 2 (𝜑𝜏)
6 syl31anc.5 . 2 (((𝜓𝜒𝜃) ∧ 𝜏) → 𝜂)
74, 5, 6syl2anc 391 1 (𝜑𝜂)
 Colors of variables: wff set class Syntax hints:   → wi 4   ∧ wa 97   ∧ w3a 885 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101 This theorem depends on definitions:  df-bi 110  df-3an 887 This theorem is referenced by:  syl32anc  1143  stoic4b  1322  enq0tr  6532  ltmul12a  7826  lt2msq1  7851  ledivp1  7869  lemul1ad  7905  lemul2ad  7906  lediv2ad  8645  difelfznle  8993  expubnd  9311
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