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Mirrors > Home > MPE Home > Th. List > necon3d | Unicode version |
Description: Contrapositive law deduction for inequality. (Contributed by NM, 10-Jun-2006.) |
Ref | Expression |
---|---|
necon3d.1 |
Ref | Expression |
---|---|
necon3d |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | necon3d.1 | . . 3 | |
2 | 1 | necon3ad 2667 | . 2 |
3 | df-ne 2654 | . 2 | |
4 | 2, 3 | syl6ibr 227 | 1 |
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