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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 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | noel 3362 | . . . 4 | |
2 | 1 | biorfi 735 | . . 3 |
3 | 2 | bicomi 131 | . 2 |
4 | 3 | uneqri 3213 | 1 |
Colors of variables: wff set class |
Syntax hints: wo 697 wceq 1331 wcel 1480 cun 3064 c0 3358 |
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-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-dif 3068 df-un 3070 df-nul 3359 |
This theorem is referenced by: un00 3404 disjssun 3421 difun2 3437 difdifdirss 3442 disjpr2 3582 prprc1 3626 diftpsn3 3656 iununir 3891 suc0 4328 sucprc 4329 fvun1 5480 fmptpr 5605 fvunsng 5607 fvsnun1 5610 fvsnun2 5611 fsnunfv 5614 fsnunres 5615 rdg0 6277 omv2 6354 unsnfidcex 6801 unfidisj 6803 undifdc 6805 ssfirab 6815 dju0en 7063 djuassen 7066 fzsuc2 9852 fseq1p1m1 9867 hashunlem 10543 ennnfonelem1 11909 setsresg 11986 setsslid 11998 exmid1stab 13184 |
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