Theorem syl21anbrc 1171

Description: Syllogism inference. (Contributed by Peter Mazsa, 18-Sep-2022.)

Hypotheses

Ref	Expression
syl21anbrc.1	⊢ (𝜑 → 𝜓)
syl21anbrc.2	⊢ (𝜑 → 𝜒)
syl21anbrc.3	⊢ (𝜑 → 𝜃)
syl21anbrc.4	⊢ (𝜏 ↔ ((𝜓 ∧ 𝜒) ∧ 𝜃))

Assertion

Ref	Expression
syl21anbrc	⊢ (𝜑 → 𝜏)

Proof of Theorem syl21anbrc

Step	Hyp	Ref	Expression
1		syl21anbrc.1	. . 3 ⊢ (𝜑 → 𝜓)
2		syl21anbrc.2	. . 3 ⊢ (𝜑 → 𝜒)
3		syl21anbrc.3	. . 3 ⊢ (𝜑 → 𝜃)
4	1, 2, 3	jca31 307	. 2 ⊢ (𝜑 → ((𝜓 ∧ 𝜒) ∧ 𝜃))
5		syl21anbrc.4	. 2 ⊢ (𝜏 ↔ ((𝜓 ∧ 𝜒) ∧ 𝜃))
6	4, 5	sylibr 133	1 ⊢ (𝜑 → 𝜏)

Syntax hints:   → wi 4   ∧ wa 103   ↔ wb 104

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

This theorem is referenced by: (None)