Theorem simpr21 1148

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

Assertion

Ref	Expression
simpr21	|- ( ( et /\ ( th /\ ( ph /\ ps /\ ch ) /\ ta ) ) -> ph )

Proof of Theorem simpr21

Step	Hyp	Ref	Expression
1		simp21 1094	. 2 |- ( ( th /\ ( ph /\ ps /\ ch ) /\ ta ) -> ph )
2	1	adantl 482	1 |- ( ( et /\ ( th /\ ( ph /\ ps /\ ch ) /\ ta ) ) -> ph )

Syntax hints:   -> wi 4   /\ wa 384   /\ w3a 1037

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 197  df-an 386  df-3an 1039

This theorem is referenced by:  cgr3tr4  32159  cdleme27a  35655