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Theorem tgqioo 14050

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		iooex 9907	. . . 4 ⊢ (,) ∈ V
3	2	imaex 4984	. . 3 ⊢ ((,) “ (ℚ × ℚ)) ∈ V
4		imassrn 4982	. . 3 ⊢ ((,) “ (ℚ × ℚ)) ⊆ ran (,)
5		ioof 9971	. . . . . 6 ⊢ (,):(ℝ^* × ℝ^*)⟶𝒫 ℝ
6		ffn 5366	. . . . . 6 ⊢ ((,):(ℝ^* × ℝ^)⟶𝒫 ℝ → (,) Fn (ℝ^ × ℝ^*))
7	5, 6	ax-mp 5	. . . . 5 ⊢ (,) Fn (ℝ^* × ℝ^*)
8		simpll 527	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑥 ∈ ℝ^)
9		elioo1 9911	. . . . . . . . . . . 12 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) → (𝑧 ∈ (𝑥(,)𝑦) ↔ (𝑧 ∈ ℝ^ ∧ 𝑥 < 𝑧 ∧ 𝑧 < 𝑦)))
10	9	biimpa 296	. . . . . . . . . . 11 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → (𝑧 ∈ ℝ^ ∧ 𝑥 < 𝑧 ∧ 𝑧 < 𝑦))
11	10	simp1d 1009	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑧 ∈ ℝ^)
12	10	simp2d 1010	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑥 < 𝑧)
13		qbtwnxr 10258	. . . . . . . . . 10 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑧 ∈ ℝ^* ∧ 𝑥 < 𝑧) → ∃𝑢 ∈ ℚ (𝑥 < 𝑢 ∧ 𝑢 < 𝑧))
14	8, 11, 12, 13	syl3anc 1238	. . . . . . . . 9 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → ∃𝑢 ∈ ℚ (𝑥 < 𝑢 ∧ 𝑢 < 𝑧))
15		simplr 528	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑦 ∈ ℝ^)
16	10	simp3d 1011	. . . . . . . . . 10 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → 𝑧 < 𝑦)
17		qbtwnxr 10258	. . . . . . . . . 10 ⊢ ((𝑧 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^* ∧ 𝑧 < 𝑦) → ∃𝑣 ∈ ℚ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))
18	11, 15, 16, 17	syl3anc 1238	. . . . . . . . 9 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → ∃𝑣 ∈ ℚ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))
19		reeanv 2647	. . . . . . . . . 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)))
20		df-ov 5878	. . . . . . . . . . . . . 14 ⊢ (𝑢(,)𝑣) = ((,)‘⟨𝑢, 𝑣⟩)
21		opelxpi 4659	. . . . . . . . . . . . . . . 16 ⊢ ((𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) → ⟨𝑢, 𝑣⟩ ∈ (ℚ × ℚ))
22	21	3ad2ant2 1019	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → ⟨𝑢, 𝑣⟩ ∈ (ℚ × ℚ))
23		ffun 5369	. . . . . . . . . . . . . . . . 17 ⊢ ((,):(ℝ^* × ℝ^*)⟶𝒫 ℝ → Fun (,))
24	5, 23	ax-mp 5	. . . . . . . . . . . . . . . 16 ⊢ Fun (,)
25		qssre 9630	. . . . . . . . . . . . . . . . . . 19 ⊢ ℚ ⊆ ℝ
26		ressxr 8001	. . . . . . . . . . . . . . . . . . 19 ⊢ ℝ ⊆ ℝ^*
27	25, 26	sstri 3165	. . . . . . . . . . . . . . . . . 18 ⊢ ℚ ⊆ ℝ^*
28		xpss12 4734	. . . . . . . . . . . . . . . . . 18 ⊢ ((ℚ ⊆ ℝ^* ∧ ℚ ⊆ ℝ^) → (ℚ × ℚ) ⊆ (ℝ^ × ℝ^*))
29	27, 27, 28	mp2an 426	. . . . . . . . . . . . . . . . 17 ⊢ (ℚ × ℚ) ⊆ (ℝ^* × ℝ^*)
30	5	fdmi 5374	. . . . . . . . . . . . . . . . 17 ⊢ dom (,) = (ℝ^* × ℝ^*)
31	29, 30	sseqtrri 3191	. . . . . . . . . . . . . . . 16 ⊢ (ℚ × ℚ) ⊆ dom (,)
32		funfvima2 5750	. . . . . . . . . . . . . . . 16 ⊢ ((Fun (,) ∧ (ℚ × ℚ) ⊆ dom (,)) → (⟨𝑢, 𝑣⟩ ∈ (ℚ × ℚ) → ((,)‘⟨𝑢, 𝑣⟩) ∈ ((,) “ (ℚ × ℚ))))
33	24, 31, 32	mp2an 426	. . . . . . . . . . . . . . 15 ⊢ (⟨𝑢, 𝑣⟩ ∈ (ℚ × ℚ) → ((,)‘⟨𝑢, 𝑣⟩) ∈ ((,) “ (ℚ × ℚ)))
34	22, 33	syl 14	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → ((,)‘⟨𝑢, 𝑣⟩) ∈ ((,) “ (ℚ × ℚ)))
35	20, 34	eqeltrid 2264	. . . . . . . . . . . . 13 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑢(,)𝑣) ∈ ((,) “ (ℚ × ℚ)))
36	11	3ad2ant1 1018	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑧 ∈ ℝ^)
37		simp3lr 1069	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑢 < 𝑧)
38		simp3rl 1070	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑧 < 𝑣)
39		simp2l 1023	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑢 ∈ ℚ)
40	27, 39	sselid 3154	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑢 ∈ ℝ^)
41		simp2r 1024	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 ∈ ℚ)
42	27, 41	sselid 3154	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 ∈ ℝ^)
43		elioo1 9911	. . . . . . . . . . . . . . 15 ⊢ ((𝑢 ∈ ℝ^* ∧ 𝑣 ∈ ℝ^) → (𝑧 ∈ (𝑢(,)𝑣) ↔ (𝑧 ∈ ℝ^ ∧ 𝑢 < 𝑧 ∧ 𝑧 < 𝑣)))
44	40, 42, 43	syl2anc 411	. . . . . . . . . . . . . 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)))
45	36, 37, 38, 44	mpbir3and 1180	. . . . . . . . . . . . 13 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑧 ∈ (𝑢(,)𝑣))
46	8	3ad2ant1 1018	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑥 ∈ ℝ^)
47		simp3ll 1068	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑥 < 𝑢)
48	46, 40, 47	xrltled 9799	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑥 ≤ 𝑢)
49		iooss1 9916	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑥 ≤ 𝑢) → (𝑢(,)𝑣) ⊆ (𝑥(,)𝑣))
50	46, 48, 49	syl2anc 411	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑢(,)𝑣) ⊆ (𝑥(,)𝑣))
51	15	3ad2ant1 1018	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑦 ∈ ℝ^)
52		simp3rr 1071	. . . . . . . . . . . . . . . 16 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 < 𝑦)
53	42, 51, 52	xrltled 9799	. . . . . . . . . . . . . . 15 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → 𝑣 ≤ 𝑦)
54		iooss2 9917	. . . . . . . . . . . . . . 15 ⊢ ((𝑦 ∈ ℝ^* ∧ 𝑣 ≤ 𝑦) → (𝑥(,)𝑣) ⊆ (𝑥(,)𝑦))
55	51, 53, 54	syl2anc 411	. . . . . . . . . . . . . 14 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑥(,)𝑣) ⊆ (𝑥(,)𝑦))
56	50, 55	sstrd 3166	. . . . . . . . . . . . 13 ⊢ ((((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) ∧ (𝑢 ∈ ℚ ∧ 𝑣 ∈ ℚ) ∧ ((𝑥 < 𝑢 ∧ 𝑢 < 𝑧) ∧ (𝑧 < 𝑣 ∧ 𝑣 < 𝑦))) → (𝑢(,)𝑣) ⊆ (𝑥(,)𝑦))
57		eleq2 2241	. . . . . . . . . . . . . . 15 ⊢ (𝑤 = (𝑢(,)𝑣) → (𝑧 ∈ 𝑤 ↔ 𝑧 ∈ (𝑢(,)𝑣)))
58		sseq1 3179	. . . . . . . . . . . . . . 15 ⊢ (𝑤 = (𝑢(,)𝑣) → (𝑤 ⊆ (𝑥(,)𝑦) ↔ (𝑢(,)𝑣) ⊆ (𝑥(,)𝑦)))
59	57, 58	anbi12d 473	. . . . . . . . . . . . . 14 ⊢ (𝑤 = (𝑢(,)𝑣) → ((𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)) ↔ (𝑧 ∈ (𝑢(,)𝑣) ∧ (𝑢(,)𝑣) ⊆ (𝑥(,)𝑦))))
60	59	rspcev 2842	. . . . . . . . . . . . 13 ⊢ (((𝑢(,)𝑣) ∈ ((,) “ (ℚ × ℚ)) ∧ (𝑧 ∈ (𝑢(,)𝑣) ∧ (𝑢(,)𝑣) ⊆ (𝑥(,)𝑦))) → ∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
61	35, 45, 56, 60	syl12anc 1236	. . . . . . . . . . . 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)))
62	61	3exp 1202	. . . . . . . . . . 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)))))
63	62	rexlimdvv 2601	. . . . . . . . . 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))))
64	19, 63	biimtrrid 153	. . . . . . . . 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))))
65	14, 18, 64	mp2and 433	. . . . . . . 8 ⊢ (((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) ∧ 𝑧 ∈ (𝑥(,)𝑦)) → ∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
66	65	ralrimiva 2550	. . . . . . 7 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) → ∀𝑧 ∈ (𝑥(,)𝑦)∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
67		qtopbas 14025	. . . . . . . 8 ⊢ ((,) “ (ℚ × ℚ)) ∈ TopBases
68		eltg2b 13557	. . . . . . . 8 ⊢ (((,) “ (ℚ × ℚ)) ∈ TopBases → ((𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ))) ↔ ∀𝑧 ∈ (𝑥(,)𝑦)∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦))))
69	67, 68	ax-mp 5	. . . . . . 7 ⊢ ((𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ))) ↔ ∀𝑧 ∈ (𝑥(,)𝑦)∃𝑤 ∈ ((,) “ (ℚ × ℚ))(𝑧 ∈ 𝑤 ∧ 𝑤 ⊆ (𝑥(,)𝑦)))
70	66, 69	sylibr 134	. . . . . 6 ⊢ ((𝑥 ∈ ℝ^* ∧ 𝑦 ∈ ℝ^*) → (𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ))))
71	70	rgen2a 2531	. . . . 5 ⊢ ∀𝑥 ∈ ℝ^* ∀𝑦 ∈ ℝ^* (𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ)))
72		ffnov 5979	. . . . 5 ⊢ ((,):(ℝ^* × ℝ^)⟶(topGen‘((,) “ (ℚ × ℚ))) ↔ ((,) Fn (ℝ^ × ℝ^) ∧ ∀𝑥 ∈ ℝ^ ∀𝑦 ∈ ℝ^* (𝑥(,)𝑦) ∈ (topGen‘((,) “ (ℚ × ℚ)))))
73	7, 71, 72	mpbir2an 942	. . . 4 ⊢ (,):(ℝ^* × ℝ^*)⟶(topGen‘((,) “ (ℚ × ℚ)))
74		frn 5375	. . . 4 ⊢ ((,):(ℝ^* × ℝ^*)⟶(topGen‘((,) “ (ℚ × ℚ))) → ran (,) ⊆ (topGen‘((,) “ (ℚ × ℚ))))
75	73, 74	ax-mp 5	. . 3 ⊢ ran (,) ⊆ (topGen‘((,) “ (ℚ × ℚ)))
76		2basgeng 13585	. . 3 ⊢ ((((,) “ (ℚ × ℚ)) ∈ V ∧ ((,) “ (ℚ × ℚ)) ⊆ ran (,) ∧ ran (,) ⊆ (topGen‘((,) “ (ℚ × ℚ)))) → (topGen‘((,) “ (ℚ × ℚ))) = (topGen‘ran (,)))
77	3, 4, 75, 76	mp3an 1337	. 2 ⊢ (topGen‘((,) “ (ℚ × ℚ))) = (topGen‘ran (,))
78	1, 77	eqtr2i 2199	1 ⊢ (topGen‘ran (,)) = 𝑄

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∧ w3a 978 = wceq 1353 ∈ wcel 2148 ∀wral 2455 ∃wrex 2456 Vcvv 2738 ⊆ wss 3130 𝒫 cpw 3576 ⟨cop 3596 class class class wbr 4004 × cxp 4625 dom cdm 4627 ran crn 4628 “ cima 4630 Fun wfun 5211 Fn wfn 5212 ⟶wf 5213 ‘cfv 5217 (class class class)co 5875 ℝcr 7810 ℝ^*cxr 7991 < clt 7992 ≤ cle 7993 ℚcq 9619 (,)cioo 9888 topGenctg 12703 TopBasesctb 13545

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-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4119 ax-sep 4122 ax-nul 4130 ax-pow 4175 ax-pr 4210 ax-un 4434 ax-setind 4537 ax-iinf 4588 ax-cnex 7902 ax-resscn 7903 ax-1cn 7904 ax-1re 7905 ax-icn 7906 ax-addcl 7907 ax-addrcl 7908 ax-mulcl 7909 ax-mulrcl 7910 ax-addcom 7911 ax-mulcom 7912 ax-addass 7913 ax-mulass 7914 ax-distr 7915 ax-i2m1 7916 ax-0lt1 7917 ax-1rid 7918 ax-0id 7919 ax-rnegex 7920 ax-precex 7921 ax-cnre 7922 ax-pre-ltirr 7923 ax-pre-ltwlin 7924 ax-pre-lttrn 7925 ax-pre-apti 7926 ax-pre-ltadd 7927 ax-pre-mulgt0 7928 ax-pre-mulext 7929 ax-arch 7930 ax-caucvg 7931

This theorem depends on definitions: df-bi 117 df-dc 835 df-3or 979 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rmo 2463 df-rab 2464 df-v 2740 df-sbc 2964 df-csb 3059 df-dif 3132 df-un 3134 df-in 3136 df-ss 3143 df-nul 3424 df-if 3536 df-pw 3578 df-sn 3599 df-pr 3600 df-op 3602 df-uni 3811 df-int 3846 df-iun 3889 df-br 4005 df-opab 4066 df-mpt 4067 df-tr 4103 df-id 4294 df-po 4297 df-iso 4298 df-iord 4367 df-on 4369 df-ilim 4370 df-suc 4372 df-iom 4591 df-xp 4633 df-rel 4634 df-cnv 4635 df-co 4636 df-dm 4637 df-rn 4638 df-res 4639 df-ima 4640 df-iota 5179 df-fun 5219 df-fn 5220 df-f 5221 df-f1 5222 df-fo 5223 df-f1o 5224 df-fv 5225 df-isom 5226 df-riota 5831 df-ov 5878 df-oprab 5879 df-mpo 5880 df-1st 6141 df-2nd 6142 df-recs 6306 df-frec 6392 df-sup 6983 df-inf 6984 df-pnf 7994 df-mnf 7995 df-xr 7996 df-ltxr 7997 df-le 7998 df-sub 8130 df-neg 8131 df-reap 8532 df-ap 8539 df-div 8630 df-inn 8920 df-2 8978 df-3 8979 df-4 8980 df-n0 9177 df-z 9254 df-uz 9529 df-q 9620 df-rp 9654 df-xneg 9772 df-ioo 9892 df-seqfrec 10446 df-exp 10520 df-cj 10851 df-re 10852 df-im 10853 df-rsqrt 11007 df-abs 11008 df-topgen 12709 df-bases 13546

This theorem is referenced by: (None)

W3C validator