| Step | Hyp | Ref
| Expression |
| 1 | | p0ex 5320 |
. . . . . 6
⊢ {∅}
∈ V |
| 2 | 1 | prid2 4702 |
. . . . 5
⊢ {∅}
∈ {∅, {∅}} |
| 3 | 2 | a1i 11 |
. . . 4
⊢ (𝑋 = ∅ → {∅}
∈ {∅, {∅}}) |
| 4 | | ixpeq1 8853 |
. . . . . 6
⊢ (𝑋 = ∅ → X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) = X𝑖 ∈ ∅ ((𝐴‘𝑖)(,)(𝐵‘𝑖))) |
| 5 | | ixp0x 8871 |
. . . . . . 7
⊢ X𝑖 ∈
∅ ((𝐴‘𝑖)(,)(𝐵‘𝑖)) = {∅} |
| 6 | 5 | a1i 11 |
. . . . . 6
⊢ (𝑋 = ∅ → X𝑖 ∈
∅ ((𝐴‘𝑖)(,)(𝐵‘𝑖)) = {∅}) |
| 7 | 4, 6 | eqtrd 2775 |
. . . . 5
⊢ (𝑋 = ∅ → X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) = {∅}) |
| 8 | | 2fveq3 6839 |
. . . . . 6
⊢ (𝑋 = ∅ →
(TopOpen‘(ℝ^‘𝑋)) =
(TopOpen‘(ℝ^‘∅))) |
| 9 | | rrxtopn0b 46746 |
. . . . . . 7
⊢
(TopOpen‘(ℝ^‘∅)) = {∅,
{∅}} |
| 10 | 9 | a1i 11 |
. . . . . 6
⊢ (𝑋 = ∅ →
(TopOpen‘(ℝ^‘∅)) = {∅,
{∅}}) |
| 11 | 8, 10 | eqtrd 2775 |
. . . . 5
⊢ (𝑋 = ∅ →
(TopOpen‘(ℝ^‘𝑋)) = {∅, {∅}}) |
| 12 | 7, 11 | eleq12d 2834 |
. . . 4
⊢ (𝑋 = ∅ → (X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ∈
(TopOpen‘(ℝ^‘𝑋)) ↔ {∅} ∈ {∅,
{∅}})) |
| 13 | 3, 12 | mpbird 258 |
. . 3
⊢ (𝑋 = ∅ → X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ∈
(TopOpen‘(ℝ^‘𝑋))) |
| 14 | 13 | adantl 482 |
. 2
⊢ ((𝜑 ∧ 𝑋 = ∅) → X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ∈
(TopOpen‘(ℝ^‘𝑋))) |
| 15 | | neqne 2943 |
. . . 4
⊢ (¬
𝑋 = ∅ → 𝑋 ≠ ∅) |
| 16 | 15 | adantl 482 |
. . 3
⊢ ((𝜑 ∧ ¬ 𝑋 = ∅) → 𝑋 ≠ ∅) |
| 17 | | fveq2 6834 |
. . . . . . . . . 10
⊢ (𝑖 = 𝑗 → (𝐴‘𝑖) = (𝐴‘𝑗)) |
| 18 | | fveq2 6834 |
. . . . . . . . . 10
⊢ (𝑖 = 𝑗 → (𝐵‘𝑖) = (𝐵‘𝑗)) |
| 19 | 17, 18 | oveq12d 7381 |
. . . . . . . . 9
⊢ (𝑖 = 𝑗 → ((𝐴‘𝑖)(,)(𝐵‘𝑖)) = ((𝐴‘𝑗)(,)(𝐵‘𝑗))) |
| 20 | 19 | cbvixpv 8860 |
. . . . . . . 8
⊢ X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) = X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗)) |
| 21 | 20 | eleq2i 2832 |
. . . . . . 7
⊢ (𝑓 ∈ X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ↔ 𝑓 ∈ X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗))) |
| 22 | 21 | bilani 505 |
. . . . . 6
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))) → 𝑓 ∈ X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗))) |
| 23 | | ioorrnopn.x |
. . . . . . . . 9
⊢ (𝜑 → 𝑋 ∈ Fin) |
| 24 | 23 | ad2antrr 732 |
. . . . . . . 8
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))) → 𝑋 ∈ Fin) |
| 25 | 21, 24 | sylan2br 601 |
. . . . . . 7
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗))) → 𝑋 ∈ Fin) |
| 26 | | simplr 774 |
. . . . . . . 8
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))) → 𝑋 ≠ ∅) |
| 27 | 21, 26 | sylan2br 601 |
. . . . . . 7
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗))) → 𝑋 ≠ ∅) |
| 28 | | ioorrnopn.a |
. . . . . . . . 9
⊢ (𝜑 → 𝐴:𝑋⟶ℝ) |
| 29 | 28 | ad2antrr 732 |
. . . . . . . 8
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))) → 𝐴:𝑋⟶ℝ) |
| 30 | 21, 29 | sylan2br 601 |
. . . . . . 7
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗))) → 𝐴:𝑋⟶ℝ) |
| 31 | | ioorrnopn.b |
. . . . . . . . 9
⊢ (𝜑 → 𝐵:𝑋⟶ℝ) |
| 32 | 31 | ad2antrr 732 |
. . . . . . . 8
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))) → 𝐵:𝑋⟶ℝ) |
| 33 | 21, 32 | sylan2br 601 |
. . . . . . 7
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗))) → 𝐵:𝑋⟶ℝ) |
| 34 | 21 | bilanri 507 |
. . . . . . 7
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗))) → 𝑓 ∈ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))) |
| 35 | | eqid 2740 |
. . . . . . 7
⊢ ran
(𝑖 ∈ 𝑋 ↦ if(((𝐵‘𝑖) − (𝑓‘𝑖)) ≤ ((𝑓‘𝑖) − (𝐴‘𝑖)), ((𝐵‘𝑖) − (𝑓‘𝑖)), ((𝑓‘𝑖) − (𝐴‘𝑖)))) = ran (𝑖 ∈ 𝑋 ↦ if(((𝐵‘𝑖) − (𝑓‘𝑖)) ≤ ((𝑓‘𝑖) − (𝐴‘𝑖)), ((𝐵‘𝑖) − (𝑓‘𝑖)), ((𝑓‘𝑖) − (𝐴‘𝑖)))) |
| 36 | | fveq2 6834 |
. . . . . . . . . . . . 13
⊢ (𝑗 = 𝑖 → (𝐵‘𝑗) = (𝐵‘𝑖)) |
| 37 | | fveq2 6834 |
. . . . . . . . . . . . 13
⊢ (𝑗 = 𝑖 → (𝑓‘𝑗) = (𝑓‘𝑖)) |
| 38 | 36, 37 | oveq12d 7381 |
. . . . . . . . . . . 12
⊢ (𝑗 = 𝑖 → ((𝐵‘𝑗) − (𝑓‘𝑗)) = ((𝐵‘𝑖) − (𝑓‘𝑖))) |
| 39 | | fveq2 6834 |
. . . . . . . . . . . . 13
⊢ (𝑗 = 𝑖 → (𝐴‘𝑗) = (𝐴‘𝑖)) |
| 40 | 37, 39 | oveq12d 7381 |
. . . . . . . . . . . 12
⊢ (𝑗 = 𝑖 → ((𝑓‘𝑗) − (𝐴‘𝑗)) = ((𝑓‘𝑖) − (𝐴‘𝑖))) |
| 41 | 38, 40 | breq12d 5092 |
. . . . . . . . . . 11
⊢ (𝑗 = 𝑖 → (((𝐵‘𝑗) − (𝑓‘𝑗)) ≤ ((𝑓‘𝑗) − (𝐴‘𝑗)) ↔ ((𝐵‘𝑖) − (𝑓‘𝑖)) ≤ ((𝑓‘𝑖) − (𝐴‘𝑖)))) |
| 42 | 41, 38, 40 | ifbieq12d 4490 |
. . . . . . . . . 10
⊢ (𝑗 = 𝑖 → if(((𝐵‘𝑗) − (𝑓‘𝑗)) ≤ ((𝑓‘𝑗) − (𝐴‘𝑗)), ((𝐵‘𝑗) − (𝑓‘𝑗)), ((𝑓‘𝑗) − (𝐴‘𝑗))) = if(((𝐵‘𝑖) − (𝑓‘𝑖)) ≤ ((𝑓‘𝑖) − (𝐴‘𝑖)), ((𝐵‘𝑖) − (𝑓‘𝑖)), ((𝑓‘𝑖) − (𝐴‘𝑖)))) |
| 43 | 42 | cbvmptv 5183 |
. . . . . . . . 9
⊢ (𝑗 ∈ 𝑋 ↦ if(((𝐵‘𝑗) − (𝑓‘𝑗)) ≤ ((𝑓‘𝑗) − (𝐴‘𝑗)), ((𝐵‘𝑗) − (𝑓‘𝑗)), ((𝑓‘𝑗) − (𝐴‘𝑗)))) = (𝑖 ∈ 𝑋 ↦ if(((𝐵‘𝑖) − (𝑓‘𝑖)) ≤ ((𝑓‘𝑖) − (𝐴‘𝑖)), ((𝐵‘𝑖) − (𝑓‘𝑖)), ((𝑓‘𝑖) − (𝐴‘𝑖)))) |
| 44 | 43 | rneqi 5886 |
. . . . . . . 8
⊢ ran
(𝑗 ∈ 𝑋 ↦ if(((𝐵‘𝑗) − (𝑓‘𝑗)) ≤ ((𝑓‘𝑗) − (𝐴‘𝑗)), ((𝐵‘𝑗) − (𝑓‘𝑗)), ((𝑓‘𝑗) − (𝐴‘𝑗)))) = ran (𝑖 ∈ 𝑋 ↦ if(((𝐵‘𝑖) − (𝑓‘𝑖)) ≤ ((𝑓‘𝑖) − (𝐴‘𝑖)), ((𝐵‘𝑖) − (𝑓‘𝑖)), ((𝑓‘𝑖) − (𝐴‘𝑖)))) |
| 45 | 44 | infeq1i 9389 |
. . . . . . 7
⊢ inf(ran
(𝑗 ∈ 𝑋 ↦ if(((𝐵‘𝑗) − (𝑓‘𝑗)) ≤ ((𝑓‘𝑗) − (𝐴‘𝑗)), ((𝐵‘𝑗) − (𝑓‘𝑗)), ((𝑓‘𝑗) − (𝐴‘𝑗)))), ℝ, < ) = inf(ran (𝑖 ∈ 𝑋 ↦ if(((𝐵‘𝑖) − (𝑓‘𝑖)) ≤ ((𝑓‘𝑖) − (𝐴‘𝑖)), ((𝐵‘𝑖) − (𝑓‘𝑖)), ((𝑓‘𝑖) − (𝐴‘𝑖)))), ℝ, < ) |
| 46 | | eqid 2740 |
. . . . . . 7
⊢ (𝑓(ball‘(𝑎 ∈ (ℝ ↑m 𝑋), 𝑏 ∈ (ℝ ↑m 𝑋) ↦
(√‘Σ𝑘
∈ 𝑋 (((𝑎‘𝑘) − (𝑏‘𝑘))↑2))))inf(ran (𝑗 ∈ 𝑋 ↦ if(((𝐵‘𝑗) − (𝑓‘𝑗)) ≤ ((𝑓‘𝑗) − (𝐴‘𝑗)), ((𝐵‘𝑗) − (𝑓‘𝑗)), ((𝑓‘𝑗) − (𝐴‘𝑗)))), ℝ, < )) = (𝑓(ball‘(𝑎 ∈ (ℝ ↑m 𝑋), 𝑏 ∈ (ℝ ↑m 𝑋) ↦
(√‘Σ𝑘
∈ 𝑋 (((𝑎‘𝑘) − (𝑏‘𝑘))↑2))))inf(ran (𝑗 ∈ 𝑋 ↦ if(((𝐵‘𝑗) − (𝑓‘𝑗)) ≤ ((𝑓‘𝑗) − (𝐴‘𝑗)), ((𝐵‘𝑗) − (𝑓‘𝑗)), ((𝑓‘𝑗) − (𝐴‘𝑗)))), ℝ, < )) |
| 47 | | fveq1 6833 |
. . . . . . . . . . . 12
⊢ (𝑎 = 𝑔 → (𝑎‘𝑘) = (𝑔‘𝑘)) |
| 48 | 47 | oveq1d 7378 |
. . . . . . . . . . 11
⊢ (𝑎 = 𝑔 → ((𝑎‘𝑘) − (𝑏‘𝑘)) = ((𝑔‘𝑘) − (𝑏‘𝑘))) |
| 49 | 48 | oveq1d 7378 |
. . . . . . . . . 10
⊢ (𝑎 = 𝑔 → (((𝑎‘𝑘) − (𝑏‘𝑘))↑2) = (((𝑔‘𝑘) − (𝑏‘𝑘))↑2)) |
| 50 | 49 | sumeq2sdv 15663 |
. . . . . . . . 9
⊢ (𝑎 = 𝑔 → Σ𝑘 ∈ 𝑋 (((𝑎‘𝑘) − (𝑏‘𝑘))↑2) = Σ𝑘 ∈ 𝑋 (((𝑔‘𝑘) − (𝑏‘𝑘))↑2)) |
| 51 | 50 | fveq2d 6838 |
. . . . . . . 8
⊢ (𝑎 = 𝑔 → (√‘Σ𝑘 ∈ 𝑋 (((𝑎‘𝑘) − (𝑏‘𝑘))↑2)) = (√‘Σ𝑘 ∈ 𝑋 (((𝑔‘𝑘) − (𝑏‘𝑘))↑2))) |
| 52 | | fveq1 6833 |
. . . . . . . . . . . 12
⊢ (𝑏 = ℎ → (𝑏‘𝑘) = (ℎ‘𝑘)) |
| 53 | 52 | oveq2d 7379 |
. . . . . . . . . . 11
⊢ (𝑏 = ℎ → ((𝑔‘𝑘) − (𝑏‘𝑘)) = ((𝑔‘𝑘) − (ℎ‘𝑘))) |
| 54 | 53 | oveq1d 7378 |
. . . . . . . . . 10
⊢ (𝑏 = ℎ → (((𝑔‘𝑘) − (𝑏‘𝑘))↑2) = (((𝑔‘𝑘) − (ℎ‘𝑘))↑2)) |
| 55 | 54 | sumeq2sdv 15663 |
. . . . . . . . 9
⊢ (𝑏 = ℎ → Σ𝑘 ∈ 𝑋 (((𝑔‘𝑘) − (𝑏‘𝑘))↑2) = Σ𝑘 ∈ 𝑋 (((𝑔‘𝑘) − (ℎ‘𝑘))↑2)) |
| 56 | 55 | fveq2d 6838 |
. . . . . . . 8
⊢ (𝑏 = ℎ → (√‘Σ𝑘 ∈ 𝑋 (((𝑔‘𝑘) − (𝑏‘𝑘))↑2)) = (√‘Σ𝑘 ∈ 𝑋 (((𝑔‘𝑘) − (ℎ‘𝑘))↑2))) |
| 57 | 51, 56 | cbvmpov 7458 |
. . . . . . 7
⊢ (𝑎 ∈ (ℝ
↑m 𝑋),
𝑏 ∈ (ℝ
↑m 𝑋)
↦ (√‘Σ𝑘 ∈ 𝑋 (((𝑎‘𝑘) − (𝑏‘𝑘))↑2))) = (𝑔 ∈ (ℝ ↑m 𝑋), ℎ ∈ (ℝ ↑m 𝑋) ↦
(√‘Σ𝑘
∈ 𝑋 (((𝑔‘𝑘) − (ℎ‘𝑘))↑2))) |
| 58 | 25, 27, 30, 33, 34, 35, 45, 46, 57 | ioorrnopnlem 46754 |
. . . . . 6
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑗 ∈ 𝑋 ((𝐴‘𝑗)(,)(𝐵‘𝑗))) → ∃𝑣 ∈ (TopOpen‘(ℝ^‘𝑋))(𝑓 ∈ 𝑣 ∧ 𝑣 ⊆ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)))) |
| 59 | 22, 58 | syldan 597 |
. . . . 5
⊢ (((𝜑 ∧ 𝑋 ≠ ∅) ∧ 𝑓 ∈ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))) → ∃𝑣 ∈ (TopOpen‘(ℝ^‘𝑋))(𝑓 ∈ 𝑣 ∧ 𝑣 ⊆ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)))) |
| 60 | 59 | ralrimiva 3132 |
. . . 4
⊢ ((𝜑 ∧ 𝑋 ≠ ∅) → ∀𝑓 ∈ X
𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))∃𝑣 ∈ (TopOpen‘(ℝ^‘𝑋))(𝑓 ∈ 𝑣 ∧ 𝑣 ⊆ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)))) |
| 61 | | eqid 2740 |
. . . . . . . 8
⊢
(TopOpen‘(ℝ^‘𝑋)) = (TopOpen‘(ℝ^‘𝑋)) |
| 62 | 61 | rrxtop 46739 |
. . . . . . 7
⊢ (𝑋 ∈ Fin →
(TopOpen‘(ℝ^‘𝑋)) ∈ Top) |
| 63 | 23, 62 | syl 17 |
. . . . . 6
⊢ (𝜑 →
(TopOpen‘(ℝ^‘𝑋)) ∈ Top) |
| 64 | 63 | adantr 481 |
. . . . 5
⊢ ((𝜑 ∧ 𝑋 ≠ ∅) →
(TopOpen‘(ℝ^‘𝑋)) ∈ Top) |
| 65 | | eltop2 22965 |
. . . . 5
⊢
((TopOpen‘(ℝ^‘𝑋)) ∈ Top → (X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ∈
(TopOpen‘(ℝ^‘𝑋)) ↔ ∀𝑓 ∈ X 𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))∃𝑣 ∈ (TopOpen‘(ℝ^‘𝑋))(𝑓 ∈ 𝑣 ∧ 𝑣 ⊆ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))))) |
| 66 | 64, 65 | syl 17 |
. . . 4
⊢ ((𝜑 ∧ 𝑋 ≠ ∅) → (X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ∈
(TopOpen‘(ℝ^‘𝑋)) ↔ ∀𝑓 ∈ X 𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))∃𝑣 ∈ (TopOpen‘(ℝ^‘𝑋))(𝑓 ∈ 𝑣 ∧ 𝑣 ⊆ X𝑖 ∈ 𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖))))) |
| 67 | 60, 66 | mpbird 258 |
. . 3
⊢ ((𝜑 ∧ 𝑋 ≠ ∅) → X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ∈
(TopOpen‘(ℝ^‘𝑋))) |
| 68 | 16, 67 | syldan 597 |
. 2
⊢ ((𝜑 ∧ ¬ 𝑋 = ∅) → X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ∈
(TopOpen‘(ℝ^‘𝑋))) |
| 69 | 14, 68 | pm2.61dan 818 |
1
⊢ (𝜑 → X𝑖 ∈
𝑋 ((𝐴‘𝑖)(,)(𝐵‘𝑖)) ∈
(TopOpen‘(ℝ^‘𝑋))) |