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Theorem syl121anc 1221
 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)
syl121anc.5 ((𝜓 ∧ (𝜒𝜃) ∧ 𝜏) → 𝜂)
Assertion
Ref Expression
syl121anc (𝜑𝜂)

Proof of Theorem syl121anc
StepHypRef Expression
1 sylXanc.1 . 2 (𝜑𝜓)
2 sylXanc.2 . . 3 (𝜑𝜒)
3 sylXanc.3 . . 3 (𝜑𝜃)
42, 3jca 304 . 2 (𝜑 → (𝜒𝜃))
5 sylXanc.4 . 2 (𝜑𝜏)
6 syl121anc.5 . 2 ((𝜓 ∧ (𝜒𝜃) ∧ 𝜏) → 𝜂)
71, 4, 5, 6syl3anc 1216 1 (𝜑𝜂)
 Colors of variables: wff set class Syntax hints:   → wi 4   ∧ wa 103   ∧ 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:  syl122anc  1225  tfisi  4501  tfrcllemsucfn  6250  sbthlemi6  6850  sbthlemi8  6852  div32apd  8574  div13apd  8575  expdivapd  10438  modfsummodlemstep  11226  ennnfonelemg  11916  ssblex  12600
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