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| Description: Subclass relationship for class union. Theorem 61 of [Suppes] p. 39. |
| Ref | Expression |
|---|---|
| uniss |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssel 2059 |
. . . . . 6
| |
| 2 | 1 | anim2d 560 |
. . . . 5
|
| 3 | 2 | 19.22dv 1288 |
. . . 4
|
| 4 | 3 | 19.21aiv 1284 |
. . 3
|
| 5 | ss2ab 2112 |
. . 3
| |
| 6 | 4, 5 | sylibr 200 |
. 2
|
| 7 | df-uni 2499 |
. 2
| |
| 8 | df-uni 2499 |
. 2
| |
| 9 | 6, 7, 8 | 3sstr4g 2098 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: unidif 2525 intssuni2 2551 sspwuni 2753 unixpss 3253 relfld 3507 unixp0 3510 trcl 4625 rankuni 4678 cflim 4889 unirnioo 6343 tgval2t 7567 unitgt 7573 tgclt 7574 tgsst 7586 basgen2t 7589 subbas2 7595 distop 7599 fctop 7600 cctop 7602 cncnplem1 7724 uniopn 7813 opnuni 7820 unirnbl 7827 dfchsup2 9236 hsupval2t 9238 hsupvalt 9239 shsupclt 9244 hsupss 9247 shsupunss 9253 shatomistic 10225 fgsb 10480 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-10 964 ax-12 966 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 979 df-sb 1170 df-clab 1462 df-cleq 1467 df-clel 1470 df-in 2047 df-ss 2049 df-uni 2499 |