Metamath Proof Explorer


Theorem simp12l

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

Ref Expression
Assertion simp12l χφψθτηφ

Proof

Step Hyp Ref Expression
1 simp2l χφψθφ
2 1 3ad2ant1 χφψθτηφ