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 φψχθ
Assertion expl φψχθ

Proof

Step Hyp Ref Expression
1 expl.1 φψχθ
2 1 exp31 φψχθ
3 2 impd φψχθ