Theorem bnj771

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

	Ref	Expression
Hypotheses	bnj771.1	⊢ ( 𝜂 ↔ ( 𝜑 ∧ 𝜓 ∧ 𝜒 ∧ 𝜃 ) )
	bnj771.2	⊢ ( 𝜒 → 𝜏 )
Assertion	bnj771	⊢ ( 𝜂 → 𝜏 )

Proof

Step	Hyp	Ref	Expression
1		bnj771.1	⊢ ( 𝜂 ↔ ( 𝜑 ∧ 𝜓 ∧ 𝜒 ∧ 𝜃 ) )
2		bnj771.2	⊢ ( 𝜒 → 𝜏 )
3	2	bnj707	⊢ ( ( 𝜑 ∧ 𝜓 ∧ 𝜒 ∧ 𝜃 ) → 𝜏 )
4	1 3	sylbi	⊢ ( 𝜂 → 𝜏 )