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Mirrors > Home > NFE Home > Th. List > necon3i | Unicode version |
Description: Contrapositive inference for inequality. (Contributed by NM, 9-Aug-2006.) |
Ref | Expression |
---|---|
necon3i.1 |
Ref | Expression |
---|---|
necon3i |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | necon3i.1 | . 2 | |
2 | id 19 | . . 3 | |
3 | 2 | necon3d 2554 | . 2 |
4 | 1, 3 | ax-mp 8 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wceq 1642 wne 2516 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-3 7 ax-mp 8 |
This theorem depends on definitions: df-bi 177 df-ne 2518 |
This theorem is referenced by: addcnnul 4453 tfin11 4493 eventfin 4517 oddtfin 4518 xpnz 5045 |
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