Metamath Proof Explorer

Theorem simpl13

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

Ref Expression
Assertion simpl13 
|- ( ( ( ( ph /\ ps /\ ch ) /\ th /\ ta ) /\ et ) -> ch )

Proof

Step Hyp Ref Expression
1 simpl3 
 |-  ( ( ( ph /\ ps /\ ch ) /\ et ) -> ch )
2 1 3ad2antl1 
 |-  ( ( ( ( ph /\ ps /\ ch ) /\ th /\ ta ) /\ et ) -> ch )