Step | Hyp | Ref
| Expression |
1 | | methaus.1 |
. . 3
⊢ 𝐽 = (MetOpen‘𝐷) |
2 | 1 | mopnex 23675 |
. 2
⊢ (𝐷 ∈ (∞Met‘𝑋) → ∃𝑑 ∈ (Met‘𝑋)𝐽 = (MetOpen‘𝑑)) |
3 | | metxmet 23487 |
. . . . . . . . . 10
⊢ (𝑑 ∈ (Met‘𝑋) → 𝑑 ∈ (∞Met‘𝑋)) |
4 | 3 | ad2antrr 723 |
. . . . . . . . 9
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → 𝑑 ∈ (∞Met‘𝑋)) |
5 | | simplrl 774 |
. . . . . . . . 9
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → 𝑥 ∈ 𝑋) |
6 | | metcl 23485 |
. . . . . . . . . . . . . 14
⊢ ((𝑑 ∈ (Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥𝑑𝑦) ∈ ℝ) |
7 | 6 | 3expb 1119 |
. . . . . . . . . . . . 13
⊢ ((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥𝑑𝑦) ∈ ℝ) |
8 | 7 | adantr 481 |
. . . . . . . . . . . 12
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (𝑥𝑑𝑦) ∈ ℝ) |
9 | | metgt0 23512 |
. . . . . . . . . . . . . 14
⊢ ((𝑑 ∈ (Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) → (𝑥 ≠ 𝑦 ↔ 0 < (𝑥𝑑𝑦))) |
10 | 9 | 3expb 1119 |
. . . . . . . . . . . . 13
⊢ ((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 ≠ 𝑦 ↔ 0 < (𝑥𝑑𝑦))) |
11 | 10 | biimpa 477 |
. . . . . . . . . . . 12
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → 0 < (𝑥𝑑𝑦)) |
12 | 8, 11 | elrpd 12769 |
. . . . . . . . . . 11
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (𝑥𝑑𝑦) ∈
ℝ+) |
13 | 12 | rphalfcld 12784 |
. . . . . . . . . 10
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → ((𝑥𝑑𝑦) / 2) ∈
ℝ+) |
14 | 13 | rpxrd 12773 |
. . . . . . . . 9
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → ((𝑥𝑑𝑦) / 2) ∈
ℝ*) |
15 | | eqid 2738 |
. . . . . . . . . 10
⊢
(MetOpen‘𝑑) =
(MetOpen‘𝑑) |
16 | 15 | blopn 23656 |
. . . . . . . . 9
⊢ ((𝑑 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ ((𝑥𝑑𝑦) / 2) ∈ ℝ*) →
(𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∈ (MetOpen‘𝑑)) |
17 | 4, 5, 14, 16 | syl3anc 1370 |
. . . . . . . 8
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∈ (MetOpen‘𝑑)) |
18 | | simplrr 775 |
. . . . . . . . 9
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → 𝑦 ∈ 𝑋) |
19 | 15 | blopn 23656 |
. . . . . . . . 9
⊢ ((𝑑 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝑋 ∧ ((𝑥𝑑𝑦) / 2) ∈ ℝ*) →
(𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∈ (MetOpen‘𝑑)) |
20 | 4, 18, 14, 19 | syl3anc 1370 |
. . . . . . . 8
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∈ (MetOpen‘𝑑)) |
21 | | blcntr 23566 |
. . . . . . . . 9
⊢ ((𝑑 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ ((𝑥𝑑𝑦) / 2) ∈ ℝ+) →
𝑥 ∈ (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2))) |
22 | 4, 5, 13, 21 | syl3anc 1370 |
. . . . . . . 8
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → 𝑥 ∈ (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2))) |
23 | | blcntr 23566 |
. . . . . . . . 9
⊢ ((𝑑 ∈ (∞Met‘𝑋) ∧ 𝑦 ∈ 𝑋 ∧ ((𝑥𝑑𝑦) / 2) ∈ ℝ+) →
𝑦 ∈ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2))) |
24 | 4, 18, 13, 23 | syl3anc 1370 |
. . . . . . . 8
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → 𝑦 ∈ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2))) |
25 | 13 | rpred 12772 |
. . . . . . . . . . . 12
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → ((𝑥𝑑𝑦) / 2) ∈ ℝ) |
26 | 25, 25 | rexaddd 12968 |
. . . . . . . . . . 11
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (((𝑥𝑑𝑦) / 2) +𝑒 ((𝑥𝑑𝑦) / 2)) = (((𝑥𝑑𝑦) / 2) + ((𝑥𝑑𝑦) / 2))) |
27 | 8 | recnd 11003 |
. . . . . . . . . . . 12
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (𝑥𝑑𝑦) ∈ ℂ) |
28 | 27 | 2halvesd 12219 |
. . . . . . . . . . 11
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (((𝑥𝑑𝑦) / 2) + ((𝑥𝑑𝑦) / 2)) = (𝑥𝑑𝑦)) |
29 | 26, 28 | eqtrd 2778 |
. . . . . . . . . 10
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (((𝑥𝑑𝑦) / 2) +𝑒 ((𝑥𝑑𝑦) / 2)) = (𝑥𝑑𝑦)) |
30 | 8 | leidd 11541 |
. . . . . . . . . 10
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (𝑥𝑑𝑦) ≤ (𝑥𝑑𝑦)) |
31 | 29, 30 | eqbrtrd 5096 |
. . . . . . . . 9
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → (((𝑥𝑑𝑦) / 2) +𝑒 ((𝑥𝑑𝑦) / 2)) ≤ (𝑥𝑑𝑦)) |
32 | | bldisj 23551 |
. . . . . . . . 9
⊢ (((𝑑 ∈ (∞Met‘𝑋) ∧ 𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋) ∧ (((𝑥𝑑𝑦) / 2) ∈ ℝ* ∧
((𝑥𝑑𝑦) / 2) ∈ ℝ* ∧
(((𝑥𝑑𝑦) / 2) +𝑒 ((𝑥𝑑𝑦) / 2)) ≤ (𝑥𝑑𝑦))) → ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2))) = ∅) |
33 | 4, 5, 18, 14, 14, 31, 32 | syl33anc 1384 |
. . . . . . . 8
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2))) = ∅) |
34 | | eleq2 2827 |
. . . . . . . . . 10
⊢ (𝑚 = (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) → (𝑥 ∈ 𝑚 ↔ 𝑥 ∈ (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)))) |
35 | | ineq1 4139 |
. . . . . . . . . . 11
⊢ (𝑚 = (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) → (𝑚 ∩ 𝑛) = ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ 𝑛)) |
36 | 35 | eqeq1d 2740 |
. . . . . . . . . 10
⊢ (𝑚 = (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) → ((𝑚 ∩ 𝑛) = ∅ ↔ ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ 𝑛) = ∅)) |
37 | 34, 36 | 3anbi13d 1437 |
. . . . . . . . 9
⊢ (𝑚 = (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) → ((𝑥 ∈ 𝑚 ∧ 𝑦 ∈ 𝑛 ∧ (𝑚 ∩ 𝑛) = ∅) ↔ (𝑥 ∈ (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∧ 𝑦 ∈ 𝑛 ∧ ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ 𝑛) = ∅))) |
38 | | eleq2 2827 |
. . . . . . . . . 10
⊢ (𝑛 = (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) → (𝑦 ∈ 𝑛 ↔ 𝑦 ∈ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)))) |
39 | | ineq2 4140 |
. . . . . . . . . . 11
⊢ (𝑛 = (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) → ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ 𝑛) = ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)))) |
40 | 39 | eqeq1d 2740 |
. . . . . . . . . 10
⊢ (𝑛 = (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) → (((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ 𝑛) = ∅ ↔ ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2))) = ∅)) |
41 | 38, 40 | 3anbi23d 1438 |
. . . . . . . . 9
⊢ (𝑛 = (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) → ((𝑥 ∈ (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∧ 𝑦 ∈ 𝑛 ∧ ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ 𝑛) = ∅) ↔ (𝑥 ∈ (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∧ 𝑦 ∈ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∧ ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2))) = ∅))) |
42 | 37, 41 | rspc2ev 3572 |
. . . . . . . 8
⊢ (((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∈ (MetOpen‘𝑑) ∧ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∈ (MetOpen‘𝑑) ∧ (𝑥 ∈ (𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∧ 𝑦 ∈ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∧ ((𝑥(ball‘𝑑)((𝑥𝑑𝑦) / 2)) ∩ (𝑦(ball‘𝑑)((𝑥𝑑𝑦) / 2))) = ∅)) → ∃𝑚 ∈ (MetOpen‘𝑑)∃𝑛 ∈ (MetOpen‘𝑑)(𝑥 ∈ 𝑚 ∧ 𝑦 ∈ 𝑛 ∧ (𝑚 ∩ 𝑛) = ∅)) |
43 | 17, 20, 22, 24, 33, 42 | syl113anc 1381 |
. . . . . . 7
⊢ (((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) ∧ 𝑥 ≠ 𝑦) → ∃𝑚 ∈ (MetOpen‘𝑑)∃𝑛 ∈ (MetOpen‘𝑑)(𝑥 ∈ 𝑚 ∧ 𝑦 ∈ 𝑛 ∧ (𝑚 ∩ 𝑛) = ∅)) |
44 | 43 | ex 413 |
. . . . . 6
⊢ ((𝑑 ∈ (Met‘𝑋) ∧ (𝑥 ∈ 𝑋 ∧ 𝑦 ∈ 𝑋)) → (𝑥 ≠ 𝑦 → ∃𝑚 ∈ (MetOpen‘𝑑)∃𝑛 ∈ (MetOpen‘𝑑)(𝑥 ∈ 𝑚 ∧ 𝑦 ∈ 𝑛 ∧ (𝑚 ∩ 𝑛) = ∅))) |
45 | 44 | ralrimivva 3123 |
. . . . 5
⊢ (𝑑 ∈ (Met‘𝑋) → ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (𝑥 ≠ 𝑦 → ∃𝑚 ∈ (MetOpen‘𝑑)∃𝑛 ∈ (MetOpen‘𝑑)(𝑥 ∈ 𝑚 ∧ 𝑦 ∈ 𝑛 ∧ (𝑚 ∩ 𝑛) = ∅))) |
46 | 15 | mopntopon 23592 |
. . . . . 6
⊢ (𝑑 ∈ (∞Met‘𝑋) → (MetOpen‘𝑑) ∈ (TopOn‘𝑋)) |
47 | | ishaus2 22502 |
. . . . . 6
⊢
((MetOpen‘𝑑)
∈ (TopOn‘𝑋)
→ ((MetOpen‘𝑑)
∈ Haus ↔ ∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (𝑥 ≠ 𝑦 → ∃𝑚 ∈ (MetOpen‘𝑑)∃𝑛 ∈ (MetOpen‘𝑑)(𝑥 ∈ 𝑚 ∧ 𝑦 ∈ 𝑛 ∧ (𝑚 ∩ 𝑛) = ∅)))) |
48 | 3, 46, 47 | 3syl 18 |
. . . . 5
⊢ (𝑑 ∈ (Met‘𝑋) → ((MetOpen‘𝑑) ∈ Haus ↔
∀𝑥 ∈ 𝑋 ∀𝑦 ∈ 𝑋 (𝑥 ≠ 𝑦 → ∃𝑚 ∈ (MetOpen‘𝑑)∃𝑛 ∈ (MetOpen‘𝑑)(𝑥 ∈ 𝑚 ∧ 𝑦 ∈ 𝑛 ∧ (𝑚 ∩ 𝑛) = ∅)))) |
49 | 45, 48 | mpbird 256 |
. . . 4
⊢ (𝑑 ∈ (Met‘𝑋) → (MetOpen‘𝑑) ∈ Haus) |
50 | | eleq1 2826 |
. . . 4
⊢ (𝐽 = (MetOpen‘𝑑) → (𝐽 ∈ Haus ↔ (MetOpen‘𝑑) ∈ Haus)) |
51 | 49, 50 | syl5ibrcom 246 |
. . 3
⊢ (𝑑 ∈ (Met‘𝑋) → (𝐽 = (MetOpen‘𝑑) → 𝐽 ∈ Haus)) |
52 | 51 | rexlimiv 3209 |
. 2
⊢
(∃𝑑 ∈
(Met‘𝑋)𝐽 = (MetOpen‘𝑑) → 𝐽 ∈ Haus) |
53 | 2, 52 | syl 17 |
1
⊢ (𝐷 ∈ (∞Met‘𝑋) → 𝐽 ∈ Haus) |