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Related theorems Unicode version |
| Description: A member of a topology is a subset of its underlying set. |
| Ref | Expression |
|---|---|
| 1open.1 |
|
| Ref | Expression |
|---|---|
| eltopss |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elssuni 3206 |
. . 3
| |
| 2 | 1open.1 |
. . 3
| |
| 3 | 1, 2 | syl6ssr 2664 |
. 2
|
| 4 | 3 | adantl 424 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: txuni 8935 opncld 8950 clsval2 8961 ntrval2 8962 ntrss3 8968 cmclsopn 8969 opnneissb 9004 opnssneib 9005 opnneiss 9008 islp2 9023 iscnp2 9037 idcn 9042 cnpnei 9043 tx1cn 10223 tx2cn 10224 subspid 10249 fbaslim 10322 usinuniop 10341 homcard 14893 opncldf1 15402 opnregcld 15415 cnntr 15420 subntr 15425 dfcon2 15442 connsub 15443 cnconn 15444 topmtcl 15525 topjoin 15527 ist1-2 15542 isnrm2 15552 neifg 15559 ufcondr 15581 fcluscf 15612 flimfnfcls 15615 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-ex 1327 df-sb 1536 df-clab 1872 df-cleq 1877 df-clel 1880 df-v 2294 df-in 2603 df-ss 2605 df-uni 3178 |