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Mirrors > Home > ILE Home > Th. List > nelne2 | Unicode version |
Description: Two classes are different if they don't belong to the same class. (Contributed by NM, 25-Jun-2012.) |
Ref | Expression |
---|---|
nelne2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1 2100 | . . . 4 | |
2 | 1 | biimpcd 148 | . . 3 |
3 | 2 | necon3bd 2248 | . 2 |
4 | 3 | imp 115 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 97 wceq 1243 wcel 1393 wne 2204 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-5 1336 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-4 1400 ax-17 1419 ax-ial 1427 ax-ext 2022 |
This theorem depends on definitions: df-bi 110 df-cleq 2033 df-clel 2036 df-ne 2206 |
This theorem is referenced by: (None) |
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