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Mirrors > Home > ILE Home > Th. List > disjsn2 | Unicode version |
Description: Intersection of distinct singletons is disjoint. (Contributed by NM, 25-May-1998.) |
Ref | Expression |
---|---|
disjsn2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elsni 3540 | . . . 4 | |
2 | 1 | eqcomd 2143 | . . 3 |
3 | 2 | necon3ai 2355 | . 2 |
4 | disjsn 3580 | . 2 | |
5 | 3, 4 | sylibr 133 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wceq 1331 wcel 1480 wne 2306 cin 3065 c0 3358 csn 3522 |
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 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-fal 1337 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-in 3072 df-nul 3359 df-sn 3528 |
This theorem is referenced by: disjpr2 3582 difprsn1 3654 diftpsn3 3656 xpsndisj 4960 funprg 5168 funtp 5171 f1oprg 5404 xp01disjl 6324 enpr2d 6704 phplem1 6739 prfidisj 6808 djuinr 6941 pm54.43 7039 pr2nelem 7040 sumpr 11175 setsfun0 11984 setscom 11988 |
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