Metamath Proof Explorer


Theorem simp-4l

Description: Simplification of a conjunction. (Contributed by Mario Carneiro, 4-Jan-2017) (Proof shortened by Wolf Lammen, 24-May-2022)

Ref Expression
Assertion simp-4l φ ψ χ θ τ φ

Proof

Step Hyp Ref Expression
1 id φ φ
2 1 ad4antr φ ψ χ θ τ φ