Theorem necon2abii 2723

Description: Contrapositive inference for inequality. (Contributed by NM, 2-Mar-2007.)

Hypothesis

Ref	Expression
necon2abii.1

Assertion

Ref	Expression
necon2abii

Proof of Theorem necon2abii

Step	Hyp	Ref	Expression
1		necon2abii.1	. . . 4
2	1	bicomi 202	. . 3
3	2	necon1abii 2719	. 2
4	3	bicomi 202	1

Syntax hints:  -.wn 3  <->wb 184  =wceq 1395  =/=wne 2652

This theorem is referenced by:  locfindis  20031  flimsncls  20487  tsmsgsum  20637  tsmsgsumOLD  20640  wilthlem2  23343  ismblfin  30055  elnev  31345

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