Theorem anclb 570

Description: Conjoin antecedent to left of consequent. Theorem *4.7 of [WhiteheadRussell] p. 120. (Contributed by NM, 25-Jul-1999.) (Proof shortened by Wolf Lammen, 24-Mar-2013.)

Assertion

Ref	Expression
anclb	|- ( ( ph -> ps ) <-> ( ph -> ( ph /\ ps ) ) )

Proof of Theorem anclb

Step	Hyp	Ref	Expression
1		ibar 525	. 2 |- ( ph -> ( ps <-> ( ph /\ ps ) ) )
2	1	pm5.74i 260	1 |- ( ( ph -> ps ) <-> ( ph -> ( ph /\ ps ) ) )

Syntax hints:   -> wi 4   <-> wb 196   /\ wa 384

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

This theorem is referenced by:  pm4.71  662  difin  3861  bnj1021  31034  ralanid  34010  dihglblem6  36629