Theorem tgvalex 13311

Description: The topology generated by a basis is a set. (Contributed by Jim Kingdon, 4-Mar-2023.)

Assertion

Ref	Expression
tgvalex	⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) ∈ V)

Proof of Theorem tgvalex

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		tgval 13310	. 2 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) = {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)})
2		inss1 3424	. . . . . . 7 ⊢ (𝐵 ∩ 𝒫 𝑦) ⊆ 𝐵
3	2	unissi 3911	. . . . . 6 ⊢ ∪ (𝐵 ∩ 𝒫 𝑦) ⊆ ∪ 𝐵
4		sstr 3232	. . . . . 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 3296	. . . 4 ⊢ {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ {𝑦 ∣ 𝑦 ⊆ ∪ 𝐵}
7		df-pw 3651	. . . 4 ⊢ 𝒫 ∪ 𝐵 = {𝑦 ∣ 𝑦 ⊆ ∪ 𝐵}
8	6, 7	sseqtrri 3259	. . 3 ⊢ {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ 𝒫 ∪ 𝐵
9		uniexg 4530	. . . 4 ⊢ (𝐵 ∈ 𝑉 → ∪ 𝐵 ∈ V)
10	9	pwexd 4265	. . 3 ⊢ (𝐵 ∈ 𝑉 → 𝒫 ∪ 𝐵 ∈ V)
11		ssexg 4223	. . 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 2306	1 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) ∈ V)

Syntax hints:   → wi 4   ∈ wcel 2200  {cab 2215  Vcvv 2799   ∩ cin 3196   ⊆ wss 3197  𝒫 cpw 3649  ∪ cuni 3888  ‘cfv 5318  topGenctg 13302

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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-un 4524

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-sbc 3029  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-opab 4146  df-mpt 4147  df-id 4384  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-iota 5278  df-fun 5320  df-fv 5326  df-topgen 13308

This theorem is referenced by:  ptex  13312  mopnset  14531  tgcl  14753  tgidm  14763  tgss3  14767  2basgeng  14771  tgrest  14858  txvalex  14943  txval  14944  txbasval  14956