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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 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elsni 3550 |
. . . 4
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2 | 1 | eqcomd 2146 |
. . 3
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3 | 2 | necon3ai 2358 |
. 2
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4 | disjsn 3593 |
. 2
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5 | 3, 4 | sylibr 133 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-ral 2422 df-v 2691 df-dif 3078 df-in 3082 df-nul 3369 df-sn 3538 |
This theorem is referenced by: disjpr2 3595 difprsn1 3667 diftpsn3 3669 xpsndisj 4973 funprg 5181 funtp 5184 f1oprg 5419 xp01disjl 6339 enpr2d 6719 phplem1 6754 prfidisj 6823 djuinr 6956 pm54.43 7063 pr2nelem 7064 sumpr 11214 setsfun0 12034 setscom 12038 |
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