Metamath Proof Explorer


Theorem simp12l

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

Ref Expression
Assertion simp12l ( ( ( 𝜒 ∧ ( 𝜑𝜓 ) ∧ 𝜃 ) ∧ 𝜏𝜂 ) → 𝜑 )

Proof

Step Hyp Ref Expression
1 simp2l ( ( 𝜒 ∧ ( 𝜑𝜓 ) ∧ 𝜃 ) → 𝜑 )
2 1 3ad2ant1 ( ( ( 𝜒 ∧ ( 𝜑𝜓 ) ∧ 𝜃 ) ∧ 𝜏𝜂 ) → 𝜑 )