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Mirrors > Home > MPE Home > Th. List > toptopon2 | Structured version Visualization version GIF version |
Description: A topology is the same thing as a topology on the union of its open sets. (Contributed by BJ, 27-Apr-2021.) |
Ref | Expression |
---|---|
toptopon2 | ⊢ (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘∪ 𝐽)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2798 | . 2 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
2 | 1 | toptopon 21522 | 1 ⊢ (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘∪ 𝐽)) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 ∈ wcel 2111 ∪ cuni 4800 ‘cfv 6324 Topctop 21498 TopOnctopon 21515 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-pw 4499 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-iota 6283 df-fun 6326 df-fv 6332 df-topon 21516 |
This theorem is referenced by: topontopon 21524 toprntopon 21530 neiptopreu 21738 lmcvg 21867 cnss1 21881 cnss2 21882 cnrest2 21891 cnrest2r 21892 lmss 21903 lmcnp 21909 lmcn 21910 t1t0 21953 haust1 21957 restcnrm 21967 resthauslem 21968 lmmo 21985 rncmp 22001 connima 22030 conncn 22031 kgeni 22142 kgenftop 22145 kgenss 22148 kgenhaus 22149 kgencmp2 22151 kgenidm 22152 1stckgen 22159 kgencn3 22163 kgen2cn 22164 dfac14 22223 ptcnplem 22226 ptcnp 22227 txcnmpt 22229 ptcn 22232 txdis1cn 22240 lmcn2 22254 txkgen 22257 xkohaus 22258 xkopt 22260 cnmpt11 22268 cnmpt11f 22269 cnmpt1t 22270 cnmpt12 22272 cnmpt21 22276 cnmpt21f 22277 cnmpt2t 22278 cnmpt22 22279 cnmpt22f 22280 cnmptcom 22283 cnmptkp 22285 cnmpt2k 22293 txconn 22294 qtopss 22320 qtopeu 22321 qtopomap 22323 qtopcmap 22324 kqtop 22350 kqt0 22351 nrmr0reg 22354 regr1 22355 kqreg 22356 kqnrm 22357 hmeoqtop 22380 hmphref 22386 xpstopnlem1 22414 ptcmpfi 22418 xkocnv 22419 xkohmeo 22420 kqhmph 22424 flimsncls 22591 cnpflfi 22604 flfcnp 22609 flfcnp2 22612 cnpfcfi 22645 cnextucn 22909 cnmpopc 23533 htpyco1 23583 htpyco2 23584 phtpyco2 23595 pcopt 23627 pcopt2 23628 pcorevlem 23631 pi1cof 23664 pi1coghm 23666 |
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