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Theorem necon4bid 2582
Description: Contrapositive law deduction for inequality. (Contributed by NM, 29-Jun-2007.)
Hypothesis
Ref Expression
necon4bid.1
Assertion
Ref Expression
necon4bid

Proof of Theorem necon4bid
StepHypRef Expression
1 necon4bid.1 . . 3
21necon2bbid 2574 . 2
3 nne 2520 . 2
42, 3syl6rbb 253 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4   wb 176   wceq 1642   wne 2516
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 177  df-ne 2518
This theorem is referenced by:  nebi  2587
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