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Mirrors > Home > ILE Home > Th. List > nordeq | Unicode version |
Description: A member of an ordinal class is not equal to it. (Contributed by NM, 25-May-1998.) |
Ref | Expression |
---|---|
nordeq |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ordirr 4452 | . . . 4 | |
2 | eleq1 2200 | . . . . 5 | |
3 | 2 | notbid 656 | . . . 4 |
4 | 1, 3 | syl5ibcom 154 | . . 3 |
5 | 4 | necon2ad 2363 | . 2 |
6 | 5 | imp 123 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 103 wceq 1331 wcel 1480 wne 2306 word 4279 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 ax-setind 4447 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ne 2307 df-ral 2419 df-v 2683 df-dif 3068 df-sn 3528 |
This theorem is referenced by: phplem1 6739 |
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