Theorem anbi1ci 33996

Description: Introduce a left and the same right conjunct to the sides of a logical equivalence. (Contributed by Peter Mazsa, 7-Mar-2020.)

Hypothesis

Ref	Expression
anbi1ci.1	|- ( ph <-> ps )

Assertion

Ref	Expression
anbi1ci	|- ( ( ch /\ ph ) <-> ( ps /\ ch ) )

Proof of Theorem anbi1ci

Step	Hyp	Ref	Expression
1		anbi1ci.1	. . 3 |- ( ph <-> ps )
2	1	anbi2i 730	. 2 |- ( ( ch /\ ph ) <-> ( ch /\ ps ) )
3	2	biancom 33994	1 |- ( ( ch /\ ph ) <-> ( ps /\ ch ) )

Syntax hints:   <-> 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: (None)