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Mirrors > Home > MPE Home > Th. List > toponss | Structured version Visualization version GIF version |
Description: A member of a topology is a subset of its underlying set. (Contributed by Mario Carneiro, 21-Aug-2015.) |
Ref | Expression |
---|---|
toponss | ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐴 ∈ 𝐽) → 𝐴 ⊆ 𝑋) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elssuni 4837 | . . 3 ⊢ (𝐴 ∈ 𝐽 → 𝐴 ⊆ ∪ 𝐽) | |
2 | 1 | adantl 485 | . 2 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐴 ∈ 𝐽) → 𝐴 ⊆ ∪ 𝐽) |
3 | toponuni 21765 | . . 3 ⊢ (𝐽 ∈ (TopOn‘𝑋) → 𝑋 = ∪ 𝐽) | |
4 | 3 | adantr 484 | . 2 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐴 ∈ 𝐽) → 𝑋 = ∪ 𝐽) |
5 | 2, 4 | sseqtrrd 3928 | 1 ⊢ ((𝐽 ∈ (TopOn‘𝑋) ∧ 𝐴 ∈ 𝐽) → 𝐴 ⊆ 𝑋) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 = wceq 1543 ∈ wcel 2112 ⊆ wss 3853 ∪ cuni 4805 ‘cfv 6358 TopOnctopon 21761 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 ax-un 7501 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-ral 3056 df-rex 3057 df-rab 3060 df-v 3400 df-sbc 3684 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-op 4534 df-uni 4806 df-br 5040 df-opab 5102 df-mpt 5121 df-id 5440 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-iota 6316 df-fun 6360 df-fv 6366 df-topon 21762 |
This theorem is referenced by: en2top 21836 neiptopreu 21984 iscnp3 22095 cnntr 22126 cncnp 22131 isreg2 22228 connsub 22272 iunconnlem 22278 conncompclo 22286 1stccnp 22313 kgenidm 22398 tx1cn 22460 tx2cn 22461 xkoccn 22470 txcnp 22471 ptcnplem 22472 xkoinjcn 22538 idqtop 22557 qtopss 22566 kqfvima 22581 kqsat 22582 kqreglem1 22592 kqreglem2 22593 qtopf1 22667 fbflim 22827 flimcf 22833 flimrest 22834 isflf 22844 fclscf 22876 subgntr 22958 ghmcnp 22966 qustgpopn 22971 qustgplem 22972 tsmsxplem1 23004 tsmsxp 23006 ressusp 23116 mopnss 23298 xrtgioo 23657 lebnumlem2 23813 cfilfcls 24125 iscmet3lem2 24143 dvres3a 24765 dvmptfsum 24826 dvcnvlem 24827 dvcnv 24828 efopn 25500 txomap 31452 cnllysconn 32874 cvmlift2lem9a 32932 icccncfext 43046 dvmptconst 43074 dvmptidg 43076 qndenserrnopnlem 43456 opnvonmbllem2 43789 |
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