Theorem tgvalex 13095

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 13094	. 2 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) = {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)})
2		inss1 3393	. . . . . . 7 ⊢ (𝐵 ∩ 𝒫 𝑦) ⊆ 𝐵
3	2	unissi 3873	. . . . . 6 ⊢ ∪ (𝐵 ∩ 𝒫 𝑦) ⊆ ∪ 𝐵
4		sstr 3201	. . . . . 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 3265	. . . 4 ⊢ {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ {𝑦 ∣ 𝑦 ⊆ ∪ 𝐵}
7		df-pw 3618	. . . 4 ⊢ 𝒫 ∪ 𝐵 = {𝑦 ∣ 𝑦 ⊆ ∪ 𝐵}
8	6, 7	sseqtrri 3228	. . 3 ⊢ {𝑦 ∣ 𝑦 ⊆ ∪ (𝐵 ∩ 𝒫 𝑦)} ⊆ 𝒫 ∪ 𝐵
9		uniexg 4486	. . . 4 ⊢ (𝐵 ∈ 𝑉 → ∪ 𝐵 ∈ V)
10	9	pwexd 4225	. . 3 ⊢ (𝐵 ∈ 𝑉 → 𝒫 ∪ 𝐵 ∈ V)
11		ssexg 4183	. . 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 2282	1 ⊢ (𝐵 ∈ 𝑉 → (topGen‘𝐵) ∈ V)

Syntax hints:   → wi 4   ∈ wcel 2176  {cab 2191  Vcvv 2772   ∩ cin 3165   ⊆ wss 3166  𝒫 cpw 3616  ∪ cuni 3850  ‘cfv 5271  topGenctg 13086

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 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-13 2178  ax-14 2179  ax-ext 2187  ax-sep 4162  ax-pow 4218  ax-pr 4253  ax-un 4480

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ral 2489  df-rex 2490  df-v 2774  df-sbc 2999  df-un 3170  df-in 3172  df-ss 3179  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-br 4045  df-opab 4106  df-mpt 4107  df-id 4340  df-xp 4681  df-rel 4682  df-cnv 4683  df-co 4684  df-dm 4685  df-iota 5232  df-fun 5273  df-fv 5279  df-topgen 13092

This theorem is referenced by:  ptex  13096  mopnset  14314  tgcl  14536  tgidm  14546  tgss3  14550  2basgeng  14554  tgrest  14641  txvalex  14726  txval  14727  txbasval  14739