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Mirrors > Home > ILE Home > Th. List > disjxsn | Unicode version |
Description: A singleton collection is disjoint. (Contributed by Mario Carneiro, 14-Nov-2016.) |
Ref | Expression |
---|---|
disjxsn | Disj |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfdisj2 3768 | . 2 Disj | |
2 | moeq 2767 | . . 3 | |
3 | elsni 3416 | . . . . 5 | |
4 | 3 | adantr 270 | . . . 4 |
5 | 4 | moimi 2006 | . . 3 |
6 | 2, 5 | ax-mp 7 | . 2 |
7 | 1, 6 | mpgbir 1382 | 1 Disj |
Colors of variables: wff set class |
Syntax hints: wa 102 wceq 1284 wcel 1433 wmo 1942 csn 3398 Disj wdisj 3766 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-rmo 2356 df-v 2603 df-sn 3404 df-disj 3767 |
This theorem is referenced by: disjx0 3784 |
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