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Mirrors > Home > ILE Home > Th. List > un0 | Unicode version |
Description: The union of a class with the empty set is itself. Theorem 24 of [Suppes] p. 27. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
un0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 3372 |
. . . 4
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2 | 1 | biorfi 736 |
. . 3
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3 | 2 | bicomi 131 |
. 2
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4 | 3 | uneqri 3223 |
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-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-dif 3078 df-un 3080 df-nul 3369 |
This theorem is referenced by: un00 3414 disjssun 3431 difun2 3447 difdifdirss 3452 disjpr2 3595 prprc1 3639 diftpsn3 3669 iununir 3904 suc0 4341 sucprc 4342 fvun1 5495 fmptpr 5620 fvunsng 5622 fvsnun1 5625 fvsnun2 5626 fsnunfv 5629 fsnunres 5630 rdg0 6292 omv2 6369 unsnfidcex 6816 unfidisj 6818 undifdc 6820 ssfirab 6830 dju0en 7087 djuassen 7090 fzsuc2 9890 fseq1p1m1 9905 hashunlem 10582 ennnfonelem1 11956 setsresg 12036 setsslid 12048 exmid1stab 13368 |
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