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Theorem tgqioo 24315

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 13423	. . . . . 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 13363	. . . . . . . . . . . 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 13178	. . . . . . . . . 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 13178	. . . . . . . . . 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 7411	. . . . . . . . . . . . . 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 12942	. . . . . . . . . . . . . . . . . . 19 ⊢ ℚ ⊆ ℝ
24		ressxr 11257	. . . . . . . . . . . . . . . . . . 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 7232	. . . . . . . . . . . . . . . 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 13363	. . . . . . . . . . . . . . 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 13128	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑥 ≤ 𝑢)
47		iooss1 13358	. . . . . . . . . . . . . . 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 13128	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 ≤ 𝑦)
52		iooss2 13359	. . . . . . . . . . . . . . 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 24275	. . . . . . . 8 ⊢ ((,) “ (ℚ × ℚ)) ∈ TopBases
66		eltg2b 22461	. . . . . . . 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 7534	. . . . 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 22492	. . 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 7408 ℝcr 11108 ℝ^*cxr 11246 < clt 11247 ≤ cle 11248 ℚcq 12931 (,)cioo 13323 topGenctg 17382 TopBasesctb 22447

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 7724 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186 ax-pre-sup 11187

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 7364 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7855 df-1st 7974 df-2nd 7975 df-frecs 8265 df-wrecs 8296 df-recs 8370 df-rdg 8409 df-er 8702 df-en 8939 df-dom 8940 df-sdom 8941 df-sup 9436 df-inf 9437 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-div 11871 df-nn 12212 df-n0 12472 df-z 12558 df-uz 12822 df-q 12932 df-ioo 13327 df-topgen 17388 df-bases 22448

This theorem is referenced by: re2ndc 24316 opnmblALT 25119 mbfimaopnlem 25171 tgqioo2 44250

W3C validator