Theorem bi2anan9r 602

Description: Deduction joining two equivalences to form equivalence of conjunctions. (Contributed by NM, 19-Feb-1996.)

Hypotheses

Ref	Expression
bi2an9.1	|- ( ph -> ( ps <-> ch ) )
bi2an9.2	|- ( th -> ( ta <-> et ) )

Assertion

Ref	Expression
bi2anan9r	|- ( ( th /\ ph ) -> ( ( ps /\ ta ) <-> ( ch /\ et ) ) )

Proof of Theorem bi2anan9r

Step	Hyp	Ref	Expression
1		bi2an9.1	. . 3 |- ( ph -> ( ps <-> ch ) )
2		bi2an9.2	. . 3 |- ( th -> ( ta <-> et ) )
3	1, 2	bi2anan9 601	. 2 |- ( ( ph /\ th ) -> ( ( ps /\ ta ) <-> ( ch /\ et ) ) )
4	3	ancoms 266	1 |- ( ( th /\ ph ) -> ( ( ps /\ ta ) <-> ( ch /\ et ) ) )

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104

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

This theorem depends on definitions:  df-bi 116

This theorem is referenced by:  pcval  12250