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Mirrors > Home > ILE Home > Th. List > elssuni | Unicode version |
Description: An element of a class is a subclass of its union. Theorem 8.6 of [Quine] p. 54. Also the basis for Proposition 7.20 of [TakeutiZaring] p. 40. (Contributed by NM, 6-Jun-1994.) |
Ref | Expression |
---|---|
elssuni |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssid 3122 |
. 2
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2 | ssuni 3766 |
. 2
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3 | 1, 2 | mpan 421 |
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-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-in 3082 df-ss 3089 df-uni 3745 |
This theorem is referenced by: unissel 3773 ssunieq 3777 pwuni 4124 pwel 4148 uniopel 4186 iunpw 4409 dmrnssfld 4810 fvssunirng 5444 relfvssunirn 5445 sefvex 5450 riotaexg 5742 pwuninel2 6187 tfrlem9 6224 tfrexlem 6239 sbthlem1 6853 sbthlem2 6854 unirnioo 9786 eltopss 12215 toponss 12232 isbasis3g 12252 baspartn 12256 bastg 12269 tgcl 12272 epttop 12298 difopn 12316 ssntr 12330 isopn3 12333 isopn3i 12343 neiuni 12369 resttopon 12379 restopn2 12391 ssidcn 12418 lmtopcnp 12458 txuni2 12464 hmeoimaf1o 12522 tgioo 12754 bj-elssuniab 13169 |
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