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Mirrors > Home > NFE Home > Th. List > nemtbir | Unicode version |
Description: An inference from an inequality, related to modus tollens. (Contributed by NM, 13-Apr-2007.) |
Ref | Expression |
---|---|
nemtbir.1 | |
nemtbir.2 |
Ref | Expression |
---|---|
nemtbir |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nemtbir.1 | . . 3 | |
2 | df-ne 2518 | . . 3 | |
3 | 1, 2 | mpbi 199 | . 2 |
4 | nemtbir.2 | . 2 | |
5 | 3, 4 | mtbir 290 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 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: ncvsq 6256 |
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