Theorem mt2bi 338

Description: A false consequent falsifies an antecedent. (Contributed by NM, 19-Aug-1993.) (Proof shortened by Wolf Lammen, 12-Nov-2012.)

Hypothesis

Ref	Expression
mt2bi.1

Assertion

Ref	Expression
mt2bi

Proof of Theorem mt2bi

Step	Hyp	Ref	Expression
1		mt2bi.1	. . 3
2	1	a1bi 337	. 2
3		con2b 334	. 2
4	2, 3	bitri 249	1

Syntax hints:  -.wn 3  ->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