Metamath Proof Explorer


Theorem simpl23

Description: Simplification of conjunction. (Contributed by NM, 9-Mar-2012) (Proof shortened by Wolf Lammen, 24-Jun-2022)

Ref Expression
Assertion simpl23 θφψχτηχ

Proof

Step Hyp Ref Expression
1 simpl3 φψχηχ
2 1 3ad2antl2 θφψχτηχ