Theorem simp12l

Description: Simplification of conjunction. (Contributed by NM, 9-Mar-2012)

	Ref	Expression
Assertion	simp12l	⊢ ( ( ( 𝜒 ∧ ( 𝜑 ∧ 𝜓 ) ∧ 𝜃 ) ∧ 𝜏 ∧ 𝜂 ) → 𝜑 )

Proof

Step	Hyp	Ref	Expression
1		simp2l	⊢ ( ( 𝜒 ∧ ( 𝜑 ∧ 𝜓 ) ∧ 𝜃 ) → 𝜑 )
2	1	3ad2ant1	⊢ ( ( ( 𝜒 ∧ ( 𝜑 ∧ 𝜓 ) ∧ 𝜃 ) ∧ 𝜏 ∧ 𝜂 ) → 𝜑 )