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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 12218 | . 2 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) = {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)}) | |
2 | inss1 3296 | . . . . . . 7 ⊢ (𝐵 ∩ 𝒫 𝑦) ⊆ 𝐵 | |
3 | 2 | unissi 3759 | . . . . . 6 ⊢ ∪ (𝐵 ∩ 𝒫 𝑦) ⊆ ∪ 𝐵 |
4 | sstr 3105 | . . . . . 6 ⊢ ((𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦) ∧ ∪ (𝐵 ∩ 𝒫 𝑦) ⊆ ∪ 𝐵) → 𝑦 ⊆ ∪ 𝐵) | |
5 | 3, 4 | mpan2 421 | . . . . 5 ⊢ (𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦) → 𝑦 ⊆ ∪ 𝐵) |
6 | 5 | ss2abi 3169 | . . . 4 ⊢ {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ {𝑦 ∣ 𝑦 ⊆ ∪ 𝐵} |
7 | df-pw 3512 | . . . 4 ⊢ 𝒫 ∪ 𝐵 = {𝑦 ∣ 𝑦 ⊆ ∪ 𝐵} | |
8 | 6, 7 | sseqtrri 3132 | . . 3 ⊢ {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ 𝒫 ∪ 𝐵 |
9 | uniexg 4361 | . . . 4 ⊢ (𝐵 ∈ 𝑉 → ∪ 𝐵 ∈ V) | |
10 | 9 | pwexd 4105 | . . 3 ⊢ (𝐵 ∈ 𝑉 → 𝒫 ∪ 𝐵 ∈ V) |
11 | ssexg 4067 | . . 3 ⊢ (({𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ 𝒫 ∪ 𝐵 ∧ 𝒫 ∪ 𝐵 ∈ V) → {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ∈ V) | |
12 | 8, 10, 11 | sylancr 410 | . 2 ⊢ (𝐵 ∈ 𝑉 → {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ∈ V) |
13 | 1, 12 | eqeltrd 2216 | 1 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 1480 {cab 2125 Vcvv 2686 ∩ cin 3070 ⊆ wss 3071 𝒫 cpw 3510 ∪ cuni 3736 ‘cfv 5123 topGenctg 12135 |
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-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 ax-un 4355 |
This theorem depends on definitions: df-bi 116 df-3an 964 df-tru 1334 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-v 2688 df-sbc 2910 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-br 3930 df-opab 3990 df-mpt 3991 df-id 4215 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-iota 5088 df-fun 5125 df-fv 5131 df-topgen 12141 |
This theorem is referenced by: tgcl 12233 tgidm 12243 tgss3 12247 2basgeng 12251 tgrest 12338 txvalex 12423 txval 12424 txbasval 12436 |
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