Theorem expi 149

Description: An exportation inference. (Contributed by NM, 29-Dec-1992.) (Proof shortened by Mel L. O'Cat, 28-Nov-2008.)

Hypothesis

Ref	Expression
expi.1

Assertion

Ref	Expression
expi

Proof of Theorem expi

Step	Hyp	Ref	Expression
1		pm3.2im 145	. 2
2		expi.1	. 2
3	1, 2	syl6 33	1

Syntax hints:  -.wn 3  ->wi 4

This theorem is referenced by:  bi3  187  imbi12  322  ex  434

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8