Theorem bnj837 35392

Description: ∧-manipulation. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.) (New usage is discouraged.)

Hypotheses

Ref	Expression
bnj837.1	⊢ (𝜂 ↔ (𝜑 ∧ 𝜓 ∧ 𝜒))
bnj837.2	⊢ (𝜒 → 𝜏)

Assertion

Ref	Expression
bnj837	⊢ (𝜂 → 𝜏)

Proof of Theorem bnj837

Step	Hyp	Ref	Expression
1		bnj837.1	. 2 ⊢ (𝜂 ↔ (𝜑 ∧ 𝜓 ∧ 𝜒))
2		bnj837.2	. . 3 ⊢ (𝜒 → 𝜏)
3	2	3ad2ant3 1153	. 2 ⊢ ((𝜑 ∧ 𝜓 ∧ 𝜒) → 𝜏)
4	1, 3	sylbi 220	1 ⊢ (𝜂 → 𝜏)

This proof depends on syntax axioms:   → wi 4   ↔ wb 209   ∧ w3a 1103

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This proof depends on definitions:  df-bi 210  df-an 402  df-3an 1105

This theorem is used by:  bnj1379  35460  bnj557  35531  bnj1175  35634  bnj1189  35639  bnj1417  35671