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Mirrors > Home > ILE Home > Th. List > tgvalex | GIF version |
Description: The topology generated by a basis is a set. (Contributed by Jim Kingdon, 4-Mar-2023.) |
Ref | Expression |
---|---|
tgvalex | ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tgval 12873 | . 2 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) = {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)}) | |
2 | inss1 3379 | . . . . . . 7 ⊢ (𝐵 ∩ 𝒫 𝑦) ⊆ 𝐵 | |
3 | 2 | unissi 3858 | . . . . . 6 ⊢ ∪ (𝐵 ∩ 𝒫 𝑦) ⊆ ∪ 𝐵 |
4 | sstr 3187 | . . . . . 6 ⊢ ((𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦) ∧ ∪ (𝐵 ∩ 𝒫 𝑦) ⊆ ∪ 𝐵) → 𝑦 ⊆ ∪ 𝐵) | |
5 | 3, 4 | mpan2 425 | . . . . 5 ⊢ (𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦) → 𝑦 ⊆ ∪ 𝐵) |
6 | 5 | ss2abi 3251 | . . . 4 ⊢ {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ {𝑦 ∣ 𝑦 ⊆ ∪ 𝐵} |
7 | df-pw 3603 | . . . 4 ⊢ 𝒫 ∪ 𝐵 = {𝑦 ∣ 𝑦 ⊆ ∪ 𝐵} | |
8 | 6, 7 | sseqtrri 3214 | . . 3 ⊢ {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ 𝒫 ∪ 𝐵 |
9 | uniexg 4470 | . . . 4 ⊢ (𝐵 ∈ 𝑉 → ∪ 𝐵 ∈ V) | |
10 | 9 | pwexd 4210 | . . 3 ⊢ (𝐵 ∈ 𝑉 → 𝒫 ∪ 𝐵 ∈ V) |
11 | ssexg 4168 | . . 3 ⊢ (({𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ 𝒫 ∪ 𝐵 ∧ 𝒫 ∪ 𝐵 ∈ V) → {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ∈ V) | |
12 | 8, 10, 11 | sylancr 414 | . 2 ⊢ (𝐵 ∈ 𝑉 → {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ∈ V) |
13 | 1, 12 | eqeltrd 2270 | 1 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2164 {cab 2179 Vcvv 2760 ∩ cin 3152 ⊆ wss 3153 𝒫 cpw 3601 ∪ cuni 3835 ‘cfv 5254 topGenctg 12865 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2166 ax-14 2167 ax-ext 2175 ax-sep 4147 ax-pow 4203 ax-pr 4238 ax-un 4464 |
This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-nf 1472 df-sb 1774 df-eu 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ral 2477 df-rex 2478 df-v 2762 df-sbc 2986 df-un 3157 df-in 3159 df-ss 3166 df-pw 3603 df-sn 3624 df-pr 3625 df-op 3627 df-uni 3836 df-br 4030 df-opab 4091 df-mpt 4092 df-id 4324 df-xp 4665 df-rel 4666 df-cnv 4667 df-co 4668 df-dm 4669 df-iota 5215 df-fun 5256 df-fv 5262 df-topgen 12871 |
This theorem is referenced by: ptex 12875 tgcl 14232 tgidm 14242 tgss3 14246 2basgeng 14250 tgrest 14337 txvalex 14422 txval 14423 txbasval 14435 |
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