Theorem 3bitrrd 213

Description: Deduction from transitivity of biconditional. (Contributed by NM, 4-Aug-2006.)

Hypotheses

Ref	Expression
3bitrd.1	|- ( ph -> ( ps <-> ch ) )
3bitrd.2	|- ( ph -> ( ch <-> th ) )
3bitrd.3	|- ( ph -> ( th <-> ta ) )

Assertion

Ref	Expression
3bitrrd	|- ( ph -> ( ta <-> ps ) )

Proof of Theorem 3bitrrd

Step	Hyp	Ref	Expression
1		3bitrd.3	. 2 |- ( ph -> ( th <-> ta ) )
2		3bitrd.1	. . 3 |- ( ph -> ( ps <-> ch ) )
3		3bitrd.2	. . 3 |- ( ph -> ( ch <-> th ) )
4	2, 3	bitr2d 187	. 2 |- ( ph -> ( th <-> ps ) )
5	1, 4	bitr3d 188	1 |- ( ph -> ( ta <-> ps ) )

Syntax hints:   -> wi 4   <-> wb 103

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106

This theorem depends on definitions:  df-bi 115

This theorem is referenced by:  srpospr  6959  divap0b  7771  divfl0  9298  cjreb  9753