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Mirrors > Home > ILE Home > Th. List > unexg | Unicode version |
Description: A union of two sets is a set. Corollary 5.8 of [TakeutiZaring] p. 16. (Contributed by NM, 18-Sep-2006.) |
Ref | Expression |
---|---|
unexg |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 2697 | . 2 | |
2 | elex 2697 | . 2 | |
3 | unexb 4363 | . . 3 | |
4 | 3 | biimpi 119 | . 2 |
5 | 1, 2, 4 | syl2an 287 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wcel 1480 cvv 2686 cun 3069 |
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-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-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pr 4131 ax-un 4355 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-rex 2422 df-v 2688 df-un 3075 df-in 3077 df-ss 3084 df-sn 3533 df-pr 3534 df-uni 3737 |
This theorem is referenced by: tpexg 4365 eldifpw 4398 xpexg 4653 tposexg 6155 tfrlemisucaccv 6222 tfrlemibxssdm 6224 tfrlemibfn 6225 tfr1onlemsucaccv 6238 tfr1onlembxssdm 6240 tfr1onlembfn 6241 tfrcllemsucaccv 6251 tfrcllembxssdm 6253 tfrcllembfn 6254 rdgtfr 6271 rdgruledefgg 6272 rdgivallem 6278 djuex 6928 zfz1isolem1 10583 ennnfonelemp1 11919 setsvalg 11989 setsex 11991 setsslid 12009 strleund 12047 |
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