| Step | Hyp | Ref
| Expression |
| 1 | | simp1 1136 |
. . . . 5
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) → 𝑀 ∈ (∞Met‘𝑋)) |
| 2 | | rexr 11286 |
. . . . . 6
⊢ (𝑅 ∈ ℝ → 𝑅 ∈
ℝ*) |
| 3 | | blssm 24362 |
. . . . . 6
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ*) → (𝑌(ball‘𝑀)𝑅) ⊆ 𝑋) |
| 4 | 2, 3 | syl3an3 1165 |
. . . . 5
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) → (𝑌(ball‘𝑀)𝑅) ⊆ 𝑋) |
| 5 | | xmetres2 24305 |
. . . . 5
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ (𝑌(ball‘𝑀)𝑅) ⊆ 𝑋) → (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (∞Met‘(𝑌(ball‘𝑀)𝑅))) |
| 6 | 1, 4, 5 | syl2anc 584 |
. . . 4
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) → (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (∞Met‘(𝑌(ball‘𝑀)𝑅))) |
| 7 | 6 | adantr 480 |
. . 3
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) = ∅) → (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (∞Met‘(𝑌(ball‘𝑀)𝑅))) |
| 8 | | rzal 4489 |
. . . 4
⊢ ((𝑌(ball‘𝑀)𝑅) = ∅ → ∀𝑥 ∈ (𝑌(ball‘𝑀)𝑅)∃𝑟 ∈ ℝ+ (𝑌(ball‘𝑀)𝑅) = (𝑥(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑟)) |
| 9 | 8 | adantl 481 |
. . 3
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) = ∅) → ∀𝑥 ∈ (𝑌(ball‘𝑀)𝑅)∃𝑟 ∈ ℝ+ (𝑌(ball‘𝑀)𝑅) = (𝑥(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑟)) |
| 10 | | isbndx 37811 |
. . 3
⊢ ((𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (Bnd‘(𝑌(ball‘𝑀)𝑅)) ↔ ((𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (∞Met‘(𝑌(ball‘𝑀)𝑅)) ∧ ∀𝑥 ∈ (𝑌(ball‘𝑀)𝑅)∃𝑟 ∈ ℝ+ (𝑌(ball‘𝑀)𝑅) = (𝑥(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑟))) |
| 11 | 7, 9, 10 | sylanbrc 583 |
. 2
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) = ∅) → (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (Bnd‘(𝑌(ball‘𝑀)𝑅))) |
| 12 | 6 | adantr 480 |
. . . 4
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (∞Met‘(𝑌(ball‘𝑀)𝑅))) |
| 13 | 1 | adantr 480 |
. . . . . 6
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → 𝑀 ∈ (∞Met‘𝑋)) |
| 14 | | simpl2 1193 |
. . . . . 6
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → 𝑌 ∈ 𝑋) |
| 15 | | simpl3 1194 |
. . . . . . 7
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → 𝑅 ∈ ℝ) |
| 16 | | xbln0 24358 |
. . . . . . . . 9
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ*) → ((𝑌(ball‘𝑀)𝑅) ≠ ∅ ↔ 0 < 𝑅)) |
| 17 | 2, 16 | syl3an3 1165 |
. . . . . . . 8
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) → ((𝑌(ball‘𝑀)𝑅) ≠ ∅ ↔ 0 < 𝑅)) |
| 18 | 17 | biimpa 476 |
. . . . . . 7
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → 0 < 𝑅) |
| 19 | 15, 18 | elrpd 13053 |
. . . . . 6
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → 𝑅 ∈
ℝ+) |
| 20 | | blcntr 24357 |
. . . . . 6
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ+) → 𝑌 ∈ (𝑌(ball‘𝑀)𝑅)) |
| 21 | 13, 14, 19, 20 | syl3anc 1373 |
. . . . 5
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → 𝑌 ∈ (𝑌(ball‘𝑀)𝑅)) |
| 22 | 14, 21 | elind 4180 |
. . . . . . 7
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → 𝑌 ∈ (𝑋 ∩ (𝑌(ball‘𝑀)𝑅))) |
| 23 | 15 | rexrd 11290 |
. . . . . . 7
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → 𝑅 ∈
ℝ*) |
| 24 | | eqid 2736 |
. . . . . . . 8
⊢ (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) = (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) |
| 25 | 24 | blres 24375 |
. . . . . . 7
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ (𝑋 ∩ (𝑌(ball‘𝑀)𝑅)) ∧ 𝑅 ∈ ℝ*) → (𝑌(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑅) = ((𝑌(ball‘𝑀)𝑅) ∩ (𝑌(ball‘𝑀)𝑅))) |
| 26 | 13, 22, 23, 25 | syl3anc 1373 |
. . . . . 6
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → (𝑌(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑅) = ((𝑌(ball‘𝑀)𝑅) ∩ (𝑌(ball‘𝑀)𝑅))) |
| 27 | | inidm 4207 |
. . . . . 6
⊢ ((𝑌(ball‘𝑀)𝑅) ∩ (𝑌(ball‘𝑀)𝑅)) = (𝑌(ball‘𝑀)𝑅) |
| 28 | 26, 27 | eqtr2di 2788 |
. . . . 5
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → (𝑌(ball‘𝑀)𝑅) = (𝑌(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑅)) |
| 29 | | rspceov 7459 |
. . . . 5
⊢ ((𝑌 ∈ (𝑌(ball‘𝑀)𝑅) ∧ 𝑅 ∈ ℝ+ ∧ (𝑌(ball‘𝑀)𝑅) = (𝑌(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑅)) → ∃𝑥 ∈ (𝑌(ball‘𝑀)𝑅)∃𝑟 ∈ ℝ+ (𝑌(ball‘𝑀)𝑅) = (𝑥(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑟)) |
| 30 | 21, 19, 28, 29 | syl3anc 1373 |
. . . 4
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → ∃𝑥 ∈ (𝑌(ball‘𝑀)𝑅)∃𝑟 ∈ ℝ+ (𝑌(ball‘𝑀)𝑅) = (𝑥(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑟)) |
| 31 | | isbnd2 37812 |
. . . 4
⊢ (((𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (Bnd‘(𝑌(ball‘𝑀)𝑅)) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) ↔ ((𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (∞Met‘(𝑌(ball‘𝑀)𝑅)) ∧ ∃𝑥 ∈ (𝑌(ball‘𝑀)𝑅)∃𝑟 ∈ ℝ+ (𝑌(ball‘𝑀)𝑅) = (𝑥(ball‘(𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))))𝑟))) |
| 32 | 12, 30, 31 | sylanbrc 583 |
. . 3
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → ((𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (Bnd‘(𝑌(ball‘𝑀)𝑅)) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅)) |
| 33 | 32 | simpld 494 |
. 2
⊢ (((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) ∧ (𝑌(ball‘𝑀)𝑅) ≠ ∅) → (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (Bnd‘(𝑌(ball‘𝑀)𝑅))) |
| 34 | 11, 33 | pm2.61dane 3020 |
1
⊢ ((𝑀 ∈ (∞Met‘𝑋) ∧ 𝑌 ∈ 𝑋 ∧ 𝑅 ∈ ℝ) → (𝑀 ↾ ((𝑌(ball‘𝑀)𝑅) × (𝑌(ball‘𝑀)𝑅))) ∈ (Bnd‘(𝑌(ball‘𝑀)𝑅))) |