Theorem ibib 342

Description: Implication in terms of implication and biconditional. (Contributed by NM, 31-Mar-1994.) (Proof shortened by Wolf Lammen, 24-Jan-2013.)

Assertion

Ref	Expression
ibib

Proof of Theorem ibib

Step	Hyp	Ref	Expression
1		pm5.501 341	. 2
2	1	pm5.74i 245	1

Syntax hints:  ->wi 4  <->wb 184

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