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Theorem tgqioo 24536

Description: The topology generated by open intervals of reals with rational endpoints is the same as the open sets of the standard metric space on the reals. In particular, this proves that the standard topology on the reals is second-countable. (Contributed by Mario Carneiro, 17-Jun-2014.)

**Hypothesis**
Ref	Expression
tgqioo.1	⊢ 𝑄 = (topGen‘((,) “ (ℚ × ℚ)))

**Assertion**
Ref	Expression
tgqioo	⊢ (topGen‘ran (,)) = 𝑄

Proof of Theorem tgqioo Dummy variables 𝑣 𝑢 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		tgqioo.1	. 2 ⊢ 𝑄 = (topGen‘((,) “ (ℚ × ℚ)))
2		imassrn 6070	. . 3 ⊢ ((,) “ (ℚ × ℚ)) ⊆ ran (,)
3		ioof 13428	. . . . . 6 ⊢ (,):(ℝ^* × ℝ^*)⟶𝒫 ℝ
4		ffn 6717	. . . . . 6 ⊢ ((,):(ℝ^* × ℝ^)⟶𝒫 ℝ → (,) Fn (ℝ^ × ℝ^*))
5	3, 4	ax-mp 5	. . . . 5 ⊢ (,) Fn (ℝ^* × ℝ^*)
6		simpll 765	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑥 ∈ ℝ^)
7		elioo1 13368	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) → (𝑧 ∈ (𝑥(,)𝑦) ↔ (𝑧 ∈ ℝ^ ∧ 𝑥 < 𝑧 ∧ 𝑧 < 𝑦)))
8	7	biimpa 477	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → (𝑧 ∈ ℝ^ ∧ 𝑥 < 𝑧 ∧ 𝑧 < 𝑦))
9	8	simp1d 1142	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑧 ∈ ℝ^)
10	8	simp2d 1143	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑥 < 𝑧)
11		qbtwnxr 13183	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑧 ∈ ℝ^* ∧ 𝑥 < 𝑧) → ∃𝑢 ∈ ℚ (𝑥 < 𝑢 ∧ 𝑢 < 𝑧))
12	6, 9, 10, 11	syl3anc 1371	. . . . . . . . 9 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → ∃𝑢 ∈ ℚ (𝑥 < 𝑢 ∧ 𝑢 < 𝑧))
13		simplr 767	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑦 ∈ ℝ^)
14	8	simp3d 1144	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑧 < 𝑦)
15		qbtwnxr 13183	. . . . . . . . . 10 ⊢ ((𝑧 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^* ∧ 𝑧 < 𝑦) → ∃𝑣 ∈ ℚ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))
16	9, 13, 14, 15	syl3anc 1371	. . . . . . . . 9 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → ∃𝑣 ∈ ℚ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))
17		reeanv 3226	. . . . . . . . . 10 ⊢ (∃𝑢 ∈ ℚ ∃𝑣 ∈ ℚ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦)) ↔ (∃𝑢 ∈ ℚ (𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ ∃𝑣 ∈ ℚ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦)))
18		df-ov 7414	. . . . . . . . . . . . . 14 ⊢ (𝑢(,)𝑣) = ((,)‘⟨𝑢, 𝑣⟩)
19		opelxpi 5713	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) → ⟨𝑢, 𝑣⟩ ∈ (ℚ × ℚ))
20	19	3ad2ant2 1134	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → ⟨𝑢, 𝑣⟩ ∈ (ℚ × ℚ))
21		ffun 6720	. . . . . . . . . . . . . . . . 17 ⊢ ((,):(ℝ^* × ℝ^*)⟶𝒫 ℝ → Fun (,))
22	3, 21	ax-mp 5	. . . . . . . . . . . . . . . 16 ⊢ Fun (,)
23		qssre 12947	. . . . . . . . . . . . . . . . . . 19 ⊢ ℚ ⊆ ℝ
24		ressxr 11262	. . . . . . . . . . . . . . . . . . 19 ⊢ ℝ ⊆ ℝ^*
25	23, 24	sstri 3991	. . . . . . . . . . . . . . . . . 18 ⊢ ℚ ⊆ ℝ^*
26		xpss12 5691	. . . . . . . . . . . . . . . . . 18 ⊢ ((ℚ ⊆ ℝ^* ∧ ℚ ⊆ ℝ^) → (ℚ × ℚ) ⊆ (ℝ^ × ℝ^*))
27	25, 25, 26	mp2an 690	. . . . . . . . . . . . . . . . 17 ⊢ (ℚ × ℚ) ⊆ (ℝ^* × ℝ^*)
28	3	fdmi 6729	. . . . . . . . . . . . . . . . 17 ⊢ dom (,) = (ℝ^* × ℝ^*)
29	27, 28	sseqtrri 4019	. . . . . . . . . . . . . . . 16 ⊢ (ℚ × ℚ) ⊆ dom (,)
30		funfvima2 7235	. . . . . . . . . . . . . . . 16 ⊢ ((Fun (,) ∧ (ℚ × ℚ) ⊆ dom (,)) → (⟨𝑢, 𝑣⟩ ∈ (ℚ × ℚ) → ((,)‘⟨𝑢, 𝑣⟩) ∈ ((,) “ (ℚ × ℚ))))
31	22, 29, 30	mp2an 690	. . . . . . . . . . . . . . 15 ⊢ (⟨𝑢, 𝑣⟩ ∈ (ℚ × ℚ) → ((,)‘⟨𝑢, 𝑣⟩) ∈ ((,) “ (ℚ × ℚ)))
32	20, 31	syl 17	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → ((,)‘⟨𝑢, 𝑣⟩) ∈ ((,) “ (ℚ × ℚ)))
33	18, 32	eqeltrid 2837	. . . . . . . . . . . . 13 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑢(,)𝑣) ∈ ((,) “ (ℚ × ℚ)))
34	9	3ad2ant1 1133	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑧 ∈ ℝ^)
35		simp3lr 1245	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑢 < 𝑧)
36		simp3rl 1246	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑧 < 𝑣)
37		simp2l 1199	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑢 ∈ ℚ)
38	25, 37	sselid 3980	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑢 ∈ ℝ^)
39		simp2r 1200	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 ∈ ℚ)
40	25, 39	sselid 3980	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 ∈ ℝ^)
41		elioo1 13368	. . . . . . . . . . . . . . 15 ⊢ ((𝑢 ∈ ℝ^* ∧ 𝑣 ∈ ℝ^) → (𝑧 ∈ (𝑢(,)𝑣) ↔ (𝑧 ∈ ℝ^ ∧ 𝑢 < 𝑧 ∧ 𝑧 < 𝑣)))
42	38, 40, 41	syl2anc 584	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑧 ∈ (𝑢(,)𝑣) ↔ (𝑧 ∈ ℝ^ ∧ 𝑢 < 𝑧 ∧ 𝑧 < 𝑣)))
43	34, 35, 36, 42	mpbir3and 1342	. . . . . . . . . . . . 13 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑧 ∈ (𝑢(,)𝑣))
44	6	3ad2ant1 1133	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑥 ∈ ℝ^)
45		simp3ll 1244	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑥 < 𝑢)
46	44, 38, 45	xrltled 13133	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑥 ≤ 𝑢)
47		iooss1 13363	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑥 ≤ 𝑢) → (𝑢(,)𝑣) ⊆ (𝑥(,)𝑣))
48	44, 46, 47	syl2anc 584	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑢(,)𝑣) ⊆ (𝑥(,)𝑣))
49	13	3ad2ant1 1133	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑦 ∈ ℝ^)
50		simp3rr 1247	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 < 𝑦)
51	40, 49, 50	xrltled 13133	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 ≤ 𝑦)
52		iooss2 13364	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ ℝ^* ∧ 𝑣 ≤ 𝑦) → (𝑥(,)𝑣) ⊆ (𝑥(,)𝑦))
53	49, 51, 52	syl2anc 584	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑥(,)𝑣) ⊆ (𝑥(,)𝑦))
54	48, 53	sstrd 3992	. . . . . . . . . . . . 13 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑢(,)𝑣) ⊆ (𝑥(,)𝑦))
55		eleq2 2822	. . . . . . . . . . . . . . 15 ⊢ (𝑤 = (𝑢(,)𝑣) → (𝑧 ∈ 𝑤 ↔ 𝑧 ∈ (𝑢(,)𝑣)))
56		sseq1 4007	. . . . . . . . . . . . . . 15 ⊢ (𝑤 = (𝑢(,)𝑣) → (𝑤 ⊆ (𝑥(,)𝑦) ↔ (𝑢(,)𝑣) ⊆ (𝑥(,)𝑦)))
57	55, 56	anbi12d 631	. . . . . . . . . . . . . 14 ⊢ (𝑤 = (𝑢(,)𝑣) → ((𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)) ↔ (𝑧 ∈ (𝑢(,)𝑣) ∧ (𝑢(,)𝑣) ⊆ (𝑥(,)𝑦))))
58	57	rspcev 3612	. . . . . . . . . . . . 13 ⊢ (((𝑢(,)𝑣) ∈ ((,) “ (ℚ × ℚ)) ∧ (𝑧 ∈ (𝑢(,)𝑣) ∧ (𝑢(,)𝑣) ⊆ (𝑥(,)𝑦))) → ∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
59	33, 43, 54, 58	syl12anc 835	. . . . . . . . . . . 12 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → ∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
60	59	3exp 1119	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → ((𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) → (((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦)) → ∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))))
61	60	rexlimdvv 3210	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → (∃𝑢 ∈ ℚ ∃𝑣 ∈ ℚ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦)) → ∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦))))
62	17, 61	biimtrrid 242	. . . . . . . . 9 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → ((∃𝑢 ∈ ℚ (𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ ∃𝑣 ∈ ℚ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦)) → ∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦))))
63	12, 16, 62	mp2and 697	. . . . . . . 8 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → ∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
64	63	ralrimiva 3146	. . . . . . 7 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) → ∀𝑧 ∈ (𝑥(,)𝑦)∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
65		qtopbas 24496	. . . . . . . 8 ⊢ ((,) “ (ℚ × ℚ)) ∈ TopBases
66		eltg2b 22682	. . . . . . . 8 ⊢ (((,) “ (ℚ × ℚ)) ∈ TopBases → ((𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ))) ↔ ∀𝑧 ∈ (𝑥(,)𝑦)∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦))))
67	65, 66	ax-mp 5	. . . . . . 7 ⊢ ((𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ))) ↔ ∀𝑧 ∈ (𝑥(,)𝑦)∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
68	64, 67	sylibr 233	. . . . . 6 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) → (𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ))))
69	68	rgen2 3197	. . . . 5 ⊢ ∀𝑥 ∈ ℝ^* ∀𝑦 ∈ ℝ^* (𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ)))
70		ffnov 7537	. . . . 5 ⊢ ((,):(ℝ^* × ℝ^)⟶(topGen‘((,) “ (ℚ × ℚ))) ↔ ((,) Fn (ℝ^ × ℝ^) ∧ ∀𝑥 ∈ ℝ^ ∀𝑦 ∈ ℝ^* (𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ)))))
71	5, 69, 70	mpbir2an 709	. . . 4 ⊢ (,):(ℝ^* × ℝ^*)⟶(topGen‘((,) “ (ℚ × ℚ)))
72		frn 6724	. . . 4 ⊢ ((,):(ℝ^* × ℝ^*)⟶(topGen‘((,) “ (ℚ × ℚ))) → ran (,) ⊆ (topGen‘((,) “ (ℚ × ℚ))))
73	71, 72	ax-mp 5	. . 3 ⊢ ran (,) ⊆ (topGen‘((,) “ (ℚ × ℚ)))
74		2basgen 22713	. . 3 ⊢ ((((,) “ (ℚ × ℚ)) ⊆ ran (,) ∧ ran (,) ⊆ (topGen‘((,) “ (ℚ × ℚ)))) → (topGen‘((,) “ (ℚ × ℚ))) = (topGen‘ran (,)))
75	2, 73, 74	mp2an 690	. 2 ⊢ (topGen‘((,) “ (ℚ × ℚ))) = (topGen‘ran (,))
76	1, 75	eqtr2i 2761	1 ⊢ (topGen‘ran (,)) = 𝑄

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ∀wral 3061 ∃wrex 3070 ⊆ wss 3948 𝒫 cpw 4602 ⟨cop 4634 class class class wbr 5148 × cxp 5674 dom cdm 5676 ran crn 5677 “ cima 5679 Fun wfun 6537 Fn wfn 6538 ⟶wf 6539 ‘cfv 6543 (class class class)co 7411 ℝcr 11111 ℝ^*cxr 11251 < clt 11252 ≤ cle 11253 ℚcq 12936 (,)cioo 13328 topGenctg 17387 TopBasesctb 22668

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7727 ax-cnex 11168 ax-resscn 11169 ax-1cn 11170 ax-icn 11171 ax-addcl 11172 ax-addrcl 11173 ax-mulcl 11174 ax-mulrcl 11175 ax-mulcom 11176 ax-addass 11177 ax-mulass 11178 ax-distr 11179 ax-i2m1 11180 ax-1ne0 11181 ax-1rid 11182 ax-rnegex 11183 ax-rrecex 11184 ax-cnre 11185 ax-pre-lttri 11186 ax-pre-lttrn 11187 ax-pre-ltadd 11188 ax-pre-mulgt0 11189 ax-pre-sup 11190

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7367 df-ov 7414 df-oprab 7415 df-mpo 7416 df-om 7858 df-1st 7977 df-2nd 7978 df-frecs 8268 df-wrecs 8299 df-recs 8373 df-rdg 8412 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-sup 9439 df-inf 9440 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258 df-sub 11450 df-neg 11451 df-div 11876 df-nn 12217 df-n0 12477 df-z 12563 df-uz 12827 df-q 12937 df-ioo 13332 df-topgen 17393 df-bases 22669

This theorem is referenced by: re2ndc 24537 opnmblALT 25344 mbfimaopnlem 25396 tgqioo2 44559

W3C validator