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Mirrors > Home > MPE Home > Th. List > necon3bid | Unicode version |
Description: Deduction from equality to inequality. (Contributed by NM, 23-Feb-2005.) (Proof shortened by Andrew Salmon, 25-May-2011.) |
Ref | Expression |
---|---|
necon3bid.1 |
Ref | Expression |
---|---|
necon3bid |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ne 2654 | . 2 | |
2 | necon3bid.1 | . . 3 | |
3 | 2 | necon3bbid 2704 | . 2 |
4 | 1, 3 | syl5bb 257 | 1 |
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