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Mirrors > Home > MPE Home > Th. List > topopn | Structured version Visualization version 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 3624 | . . 3 | |
3 | uniopn 20702 | . . 3 | |
4 | 2, 3 | mpan2 707 | . 2 |
5 | 1, 4 | syl5eqel 2705 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wceq 1483 wcel 1990 wss 3574 cuni 4436 ctop 20698 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rex 2918 df-v 3202 df-in 3581 df-ss 3588 df-pw 4160 df-uni 4437 df-top 20699 |
This theorem is referenced by: riinopn 20713 toponmax 20730 cldval 20827 ntrfval 20828 clsfval 20829 iscld 20831 ntrval 20840 clsval 20841 0cld 20842 clsval2 20854 ntrtop 20874 toponmre 20897 neifval 20903 neif 20904 neival 20906 isnei 20907 tpnei 20925 lpfval 20942 lpval 20943 restcld 20976 restcls 20985 restntr 20986 cnrest 21089 cmpsub 21203 hauscmplem 21209 cmpfi 21211 isconn2 21217 connsubclo 21227 1stcfb 21248 1stcelcls 21264 islly2 21287 lly1stc 21299 islocfin 21320 finlocfin 21323 cmpkgen 21354 llycmpkgen 21355 ptbasid 21378 ptpjpre2 21383 ptopn2 21387 xkoopn 21392 xkouni 21402 txcld 21406 txcn 21429 ptrescn 21442 txtube 21443 txhaus 21450 xkoptsub 21457 xkopt 21458 xkopjcn 21459 qtoptop 21503 qtopuni 21505 opnfbas 21646 flimval 21767 flimfil 21773 hausflim 21785 hauspwpwf1 21791 hauspwpwdom 21792 flimfnfcls 21832 cnpfcfi 21844 bcthlem5 23125 dvply1 24039 cldssbrsiga 30250 dya2iocucvr 30346 kur14lem7 31194 kur14lem9 31196 connpconn 31217 cvmliftmolem1 31263 ordtop 32435 ntrelmap 38423 clselmap 38425 dssmapntrcls 38426 dssmapclsntr 38427 reopn 39501 |
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