Theorem anabss3 555

Description: Absorption of antecedent into conjunction. (Contributed by NM, 20-Jul-1996.) (Proof shortened by Wolf Lammen, 1-Jan-2013.)

Hypothesis

Ref	Expression
anabss3.1	|- ( ( ( ph /\ ps ) /\ ps ) -> ch )

Assertion

Ref	Expression
anabss3	|- ( ( ph /\ ps ) -> ch )

Proof of Theorem anabss3

Step	Hyp	Ref	Expression
1		anabss3.1	. . 3 |- ( ( ( ph /\ ps ) /\ ps ) -> ch )
2	1	anasss 394	. 2 |- ( ( ph /\ ( ps /\ ps ) ) -> ch )
3	2	anabsan2 554	1 |- ( ( ph /\ ps ) -> ch )

Syntax hints:   -> wi 4   /\ wa 103

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107

This theorem depends on definitions:  df-bi 116

This theorem is referenced by:  3anidm23  1243  expclzaplem  10158