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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 |
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unexg |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 2700 |
. 2
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2 | elex 2700 |
. 2
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3 | unexb 4371 |
. . 3
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4 | 3 | biimpi 119 |
. 2
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5 | 1, 2, 4 | syl2an 287 |
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-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-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pr 4139 ax-un 4363 |
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-rex 2423 df-v 2691 df-un 3080 df-in 3082 df-ss 3089 df-sn 3538 df-pr 3539 df-uni 3745 |
This theorem is referenced by: tpexg 4373 eldifpw 4406 xpexg 4661 tposexg 6163 tfrlemisucaccv 6230 tfrlemibxssdm 6232 tfrlemibfn 6233 tfr1onlemsucaccv 6246 tfr1onlembxssdm 6248 tfr1onlembfn 6249 tfrcllemsucaccv 6259 tfrcllembxssdm 6261 tfrcllembfn 6262 rdgtfr 6279 rdgruledefgg 6280 rdgivallem 6286 djuex 6936 zfz1isolem1 10615 ennnfonelemp1 11955 setsvalg 12028 setsex 12030 setsslid 12048 strleund 12086 |
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