Metamath Proof Explorer


Theorem expl

Description: Export a wff from a left conjunct. (Contributed by Jeff Hankins, 28-Aug-2009)

Ref Expression
Hypothesis expl.1 φ ψ χ θ
Assertion expl φ ψ χ θ

Proof

Step Hyp Ref Expression
1 expl.1 φ ψ χ θ
2 1 exp31 φ ψ χ θ
3 2 impd φ ψ χ θ