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Mirrors > Home > ILE Home > Th. List > topopn | Unicode version |
Description: The underlying set of a topology is an open set. (Contributed by NM, 17-Jul-2006.) |
Ref | Expression |
---|---|
1open.1 |
Ref | Expression |
---|---|
topopn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1open.1 | . 2 | |
2 | ssid 3117 | . . 3 | |
3 | uniopn 12173 | . . 3 | |
4 | 2, 3 | mpan2 421 | . 2 |
5 | 1, 4 | eqeltrid 2226 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wceq 1331 wcel 1480 wss 3071 cuni 3736 ctop 12169 |
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-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 |
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-ral 2421 df-rex 2422 df-v 2688 df-in 3077 df-ss 3084 df-pw 3512 df-uni 3737 df-top 12170 |
This theorem is referenced by: toponmax 12197 cldval 12273 ntrfval 12274 clsfval 12275 iscld 12277 ntrval 12284 clsval 12285 0cld 12286 ntrtop 12302 neifval 12314 neif 12315 neival 12317 isnei 12318 tpnei 12334 cnrest 12409 txcn 12449 |
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