Theorem exp516 1216

Description: A triple exportation inference. (Contributed by Jeff Hankins, 8-Jul-2009.)

Hypothesis

Ref	Expression
exp516.1

Assertion

Ref	Expression
exp516

Proof of Theorem exp516

Step	Hyp	Ref	Expression
1		exp516.1	. . 3
2	1	exp31 604	. 2
3	2	3expd 1213	1

Syntax hints:  ->wi 4  /\wa 369  /\w3a 973

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 185  df-an 371  df-3an 975