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Theorem necon2bbii 2724
Description: Contrapositive inference for inequality. (Contributed by NM, 13-Apr-2007.)
Hypothesis
Ref Expression
necon2bbii.1
Assertion
Ref Expression
necon2bbii

Proof of Theorem necon2bbii
StepHypRef Expression
1 necon2bbii.1 . . . 4
21bicomi 202 . . 3
32necon1bbii 2721 . 2
43bicomi 202 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184  =wceq 1395  =/=wne 2652
This theorem is referenced by:  xpeq0  5432  dmsn0  5480  disjex  27451  disjexc  27452  suppss3  27550
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-ne 2654
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