Theorem syl123anc 1199

Description: Syllogism combined with contraction. (Contributed by NM, 11-Mar-2012.)

Hypotheses

Ref	Expression
sylXanc.1	⊢ (φ → ψ)
sylXanc.2	⊢ (φ → χ)
sylXanc.3	⊢ (φ → θ)
sylXanc.4	⊢ (φ → τ)
sylXanc.5	⊢ (φ → η)
sylXanc.6	⊢ (φ → ζ)
syl123anc.7	⊢ ((ψ ∧ (χ ∧ θ) ∧ (τ ∧ η ∧ ζ)) → σ)

Assertion

Ref	Expression
syl123anc	⊢ (φ → σ)

Proof of Theorem syl123anc

Step	Hyp	Ref	Expression
1		sylXanc.1	. 2 ⊢ (φ → ψ)
2		sylXanc.2	. . 3 ⊢ (φ → χ)
3		sylXanc.3	. . 3 ⊢ (φ → θ)
4	2, 3	jca 518	. 2 ⊢ (φ → (χ ∧ θ))
5		sylXanc.4	. 2 ⊢ (φ → τ)
6		sylXanc.5	. 2 ⊢ (φ → η)
7		sylXanc.6	. 2 ⊢ (φ → ζ)
8		syl123anc.7	. 2 ⊢ ((ψ ∧ (χ ∧ θ) ∧ (τ ∧ η ∧ ζ)) → σ)
9	1, 4, 5, 6, 7, 8	syl113anc 1194	1 ⊢ (φ → σ)

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)