Theorem imp5d 625

Description: An importation inference. (Contributed by Jeff Hankins, 7-Jul-2009.)

Hypothesis

Ref	Expression
imp5.1	|- ( ph -> ( ps -> ( ch -> ( th -> ( ta -> et ) ) ) ) )

Assertion

Ref	Expression
imp5d	|- ( ( ( ph /\ ps ) /\ ch ) -> ( ( th /\ ta ) -> et ) )

Proof of Theorem imp5d

Step	Hyp	Ref	Expression
1		imp5.1	. . 3 |- ( ph -> ( ps -> ( ch -> ( th -> ( ta -> et ) ) ) ) )
2	1	imp31 448	. 2 |- ( ( ( ph /\ ps ) /\ ch ) -> ( th -> ( ta -> et ) ) )
3	2	impd 447	1 |- ( ( ( ph /\ ps ) /\ ch ) -> ( ( th /\ ta ) -> et ) )

Syntax hints:   -> wi 4   /\ 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:  bcthlem5  23125