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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.)
Ref Expression

Proof of Theorem ibib
StepHypRef Expression
1 pm5.501 341 . 2
21pm5.74i 245 1
Colors of variables: wff setvar class
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
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