Proof of Theorem ax5seglem1
Step | Hyp | Ref
| Expression |
1 | | simpl2l 1107 |
. . . . 5
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) ∧ 𝑗 ∈ (1...𝑁)) → 𝐴 ∈ (𝔼‘𝑁)) |
2 | | fveecn 25582 |
. . . . 5
⊢ ((𝐴 ∈ (𝔼‘𝑁) ∧ 𝑗 ∈ (1...𝑁)) → (𝐴‘𝑗) ∈ ℂ) |
3 | 1, 2 | sylancom 698 |
. . . 4
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) ∧ 𝑗 ∈ (1...𝑁)) → (𝐴‘𝑗) ∈ ℂ) |
4 | | simpl2r 1108 |
. . . . 5
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) ∧ 𝑗 ∈ (1...𝑁)) → 𝐶 ∈ (𝔼‘𝑁)) |
5 | | fveecn 25582 |
. . . . 5
⊢ ((𝐶 ∈ (𝔼‘𝑁) ∧ 𝑗 ∈ (1...𝑁)) → (𝐶‘𝑗) ∈ ℂ) |
6 | 4, 5 | sylancom 698 |
. . . 4
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) ∧ 𝑗 ∈ (1...𝑁)) → (𝐶‘𝑗) ∈ ℂ) |
7 | | 0re 9919 |
. . . . . . . . . 10
⊢ 0 ∈
ℝ |
8 | | 1re 9918 |
. . . . . . . . . 10
⊢ 1 ∈
ℝ |
9 | 7, 8 | elicc2i 12110 |
. . . . . . . . 9
⊢ (𝑇 ∈ (0[,]1) ↔ (𝑇 ∈ ℝ ∧ 0 ≤
𝑇 ∧ 𝑇 ≤ 1)) |
10 | 9 | simp1bi 1069 |
. . . . . . . 8
⊢ (𝑇 ∈ (0[,]1) → 𝑇 ∈
ℝ) |
11 | 10 | adantr 480 |
. . . . . . 7
⊢ ((𝑇 ∈ (0[,]1) ∧
∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖)))) → 𝑇 ∈ ℝ) |
12 | 11 | 3ad2ant3 1077 |
. . . . . 6
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) → 𝑇 ∈ ℝ) |
13 | 12 | recnd 9947 |
. . . . 5
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) → 𝑇 ∈ ℂ) |
14 | 13 | adantr 480 |
. . . 4
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) ∧ 𝑗 ∈ (1...𝑁)) → 𝑇 ∈ ℂ) |
15 | | fveq2 6103 |
. . . . . . . 8
⊢ (𝑖 = 𝑗 → (𝐵‘𝑖) = (𝐵‘𝑗)) |
16 | | fveq2 6103 |
. . . . . . . . . 10
⊢ (𝑖 = 𝑗 → (𝐴‘𝑖) = (𝐴‘𝑗)) |
17 | 16 | oveq2d 6565 |
. . . . . . . . 9
⊢ (𝑖 = 𝑗 → ((1 − 𝑇) · (𝐴‘𝑖)) = ((1 − 𝑇) · (𝐴‘𝑗))) |
18 | | fveq2 6103 |
. . . . . . . . . 10
⊢ (𝑖 = 𝑗 → (𝐶‘𝑖) = (𝐶‘𝑗)) |
19 | 18 | oveq2d 6565 |
. . . . . . . . 9
⊢ (𝑖 = 𝑗 → (𝑇 · (𝐶‘𝑖)) = (𝑇 · (𝐶‘𝑗))) |
20 | 17, 19 | oveq12d 6567 |
. . . . . . . 8
⊢ (𝑖 = 𝑗 → (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))) = (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗)))) |
21 | 15, 20 | eqeq12d 2625 |
. . . . . . 7
⊢ (𝑖 = 𝑗 → ((𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))) ↔ (𝐵‘𝑗) = (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗))))) |
22 | 21 | rspccva 3281 |
. . . . . 6
⊢
((∀𝑖 ∈
(1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))) ∧ 𝑗 ∈ (1...𝑁)) → (𝐵‘𝑗) = (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗)))) |
23 | 22 | adantll 746 |
. . . . 5
⊢ (((𝑇 ∈ (0[,]1) ∧
∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖)))) ∧ 𝑗 ∈ (1...𝑁)) → (𝐵‘𝑗) = (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗)))) |
24 | 23 | 3ad2antl3 1218 |
. . . 4
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) ∧ 𝑗 ∈ (1...𝑁)) → (𝐵‘𝑗) = (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗)))) |
25 | | oveq2 6557 |
. . . . . 6
⊢ ((𝐵‘𝑗) = (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗))) → ((𝐴‘𝑗) − (𝐵‘𝑗)) = ((𝐴‘𝑗) − (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗))))) |
26 | 25 | oveq1d 6564 |
. . . . 5
⊢ ((𝐵‘𝑗) = (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗))) → (((𝐴‘𝑗) − (𝐵‘𝑗))↑2) = (((𝐴‘𝑗) − (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗))))↑2)) |
27 | | subdi 10342 |
. . . . . . . . 9
⊢ ((𝑇 ∈ ℂ ∧ (𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ) → (𝑇 · ((𝐴‘𝑗) − (𝐶‘𝑗))) = ((𝑇 · (𝐴‘𝑗)) − (𝑇 · (𝐶‘𝑗)))) |
28 | 27 | 3coml 1264 |
. . . . . . . 8
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (𝑇 · ((𝐴‘𝑗) − (𝐶‘𝑗))) = ((𝑇 · (𝐴‘𝑗)) − (𝑇 · (𝐶‘𝑗)))) |
29 | | ax-1cn 9873 |
. . . . . . . . . . . . . 14
⊢ 1 ∈
ℂ |
30 | | subcl 10159 |
. . . . . . . . . . . . . 14
⊢ ((1
∈ ℂ ∧ 𝑇
∈ ℂ) → (1 − 𝑇) ∈ ℂ) |
31 | 29, 30 | mpan 702 |
. . . . . . . . . . . . 13
⊢ (𝑇 ∈ ℂ → (1
− 𝑇) ∈
ℂ) |
32 | 31 | adantl 481 |
. . . . . . . . . . . 12
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (1 − 𝑇) ∈
ℂ) |
33 | | simpl 472 |
. . . . . . . . . . . 12
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (𝐴‘𝑗) ∈ ℂ) |
34 | | subdir 10343 |
. . . . . . . . . . . . 13
⊢ ((1
∈ ℂ ∧ (1 − 𝑇) ∈ ℂ ∧ (𝐴‘𝑗) ∈ ℂ) → ((1 − (1
− 𝑇)) · (𝐴‘𝑗)) = ((1 · (𝐴‘𝑗)) − ((1 − 𝑇) · (𝐴‘𝑗)))) |
35 | 29, 34 | mp3an1 1403 |
. . . . . . . . . . . 12
⊢ (((1
− 𝑇) ∈ ℂ
∧ (𝐴‘𝑗) ∈ ℂ) → ((1
− (1 − 𝑇))
· (𝐴‘𝑗)) = ((1 · (𝐴‘𝑗)) − ((1 − 𝑇) · (𝐴‘𝑗)))) |
36 | 32, 33, 35 | syl2anc 691 |
. . . . . . . . . . 11
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((1 − (1
− 𝑇)) · (𝐴‘𝑗)) = ((1 · (𝐴‘𝑗)) − ((1 − 𝑇) · (𝐴‘𝑗)))) |
37 | | nncan 10189 |
. . . . . . . . . . . . . 14
⊢ ((1
∈ ℂ ∧ 𝑇
∈ ℂ) → (1 − (1 − 𝑇)) = 𝑇) |
38 | 29, 37 | mpan 702 |
. . . . . . . . . . . . 13
⊢ (𝑇 ∈ ℂ → (1
− (1 − 𝑇)) =
𝑇) |
39 | 38 | oveq1d 6564 |
. . . . . . . . . . . 12
⊢ (𝑇 ∈ ℂ → ((1
− (1 − 𝑇))
· (𝐴‘𝑗)) = (𝑇 · (𝐴‘𝑗))) |
40 | 39 | adantl 481 |
. . . . . . . . . . 11
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((1 − (1
− 𝑇)) · (𝐴‘𝑗)) = (𝑇 · (𝐴‘𝑗))) |
41 | | mulid2 9917 |
. . . . . . . . . . . . 13
⊢ ((𝐴‘𝑗) ∈ ℂ → (1 · (𝐴‘𝑗)) = (𝐴‘𝑗)) |
42 | 41 | oveq1d 6564 |
. . . . . . . . . . . 12
⊢ ((𝐴‘𝑗) ∈ ℂ → ((1 · (𝐴‘𝑗)) − ((1 − 𝑇) · (𝐴‘𝑗))) = ((𝐴‘𝑗) − ((1 − 𝑇) · (𝐴‘𝑗)))) |
43 | 42 | adantr 480 |
. . . . . . . . . . 11
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((1 · (𝐴‘𝑗)) − ((1 − 𝑇) · (𝐴‘𝑗))) = ((𝐴‘𝑗) − ((1 − 𝑇) · (𝐴‘𝑗)))) |
44 | 36, 40, 43 | 3eqtr3rd 2653 |
. . . . . . . . . 10
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((𝐴‘𝑗) − ((1 − 𝑇) · (𝐴‘𝑗))) = (𝑇 · (𝐴‘𝑗))) |
45 | 44 | oveq1d 6564 |
. . . . . . . . 9
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (((𝐴‘𝑗) − ((1 − 𝑇) · (𝐴‘𝑗))) − (𝑇 · (𝐶‘𝑗))) = ((𝑇 · (𝐴‘𝑗)) − (𝑇 · (𝐶‘𝑗)))) |
46 | 45 | 3adant2 1073 |
. . . . . . . 8
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (((𝐴‘𝑗) − ((1 − 𝑇) · (𝐴‘𝑗))) − (𝑇 · (𝐶‘𝑗))) = ((𝑇 · (𝐴‘𝑗)) − (𝑇 · (𝐶‘𝑗)))) |
47 | | simp1 1054 |
. . . . . . . . 9
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (𝐴‘𝑗) ∈ ℂ) |
48 | | mulcl 9899 |
. . . . . . . . . . . 12
⊢ (((1
− 𝑇) ∈ ℂ
∧ (𝐴‘𝑗) ∈ ℂ) → ((1
− 𝑇) · (𝐴‘𝑗)) ∈ ℂ) |
49 | 31, 48 | sylan 487 |
. . . . . . . . . . 11
⊢ ((𝑇 ∈ ℂ ∧ (𝐴‘𝑗) ∈ ℂ) → ((1 − 𝑇) · (𝐴‘𝑗)) ∈ ℂ) |
50 | 49 | ancoms 468 |
. . . . . . . . . 10
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((1 − 𝑇) · (𝐴‘𝑗)) ∈ ℂ) |
51 | 50 | 3adant2 1073 |
. . . . . . . . 9
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((1 − 𝑇) · (𝐴‘𝑗)) ∈ ℂ) |
52 | | mulcl 9899 |
. . . . . . . . . . 11
⊢ ((𝑇 ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ) → (𝑇 · (𝐶‘𝑗)) ∈ ℂ) |
53 | 52 | ancoms 468 |
. . . . . . . . . 10
⊢ (((𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (𝑇 · (𝐶‘𝑗)) ∈ ℂ) |
54 | 53 | 3adant1 1072 |
. . . . . . . . 9
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (𝑇 · (𝐶‘𝑗)) ∈ ℂ) |
55 | 47, 51, 54 | subsub4d 10302 |
. . . . . . . 8
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (((𝐴‘𝑗) − ((1 − 𝑇) · (𝐴‘𝑗))) − (𝑇 · (𝐶‘𝑗))) = ((𝐴‘𝑗) − (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗))))) |
56 | 28, 46, 55 | 3eqtr2rd 2651 |
. . . . . . 7
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((𝐴‘𝑗) − (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗)))) = (𝑇 · ((𝐴‘𝑗) − (𝐶‘𝑗)))) |
57 | 56 | oveq1d 6564 |
. . . . . 6
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (((𝐴‘𝑗) − (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗))))↑2) = ((𝑇 · ((𝐴‘𝑗) − (𝐶‘𝑗)))↑2)) |
58 | | simp3 1056 |
. . . . . . 7
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → 𝑇 ∈ ℂ) |
59 | | subcl 10159 |
. . . . . . . 8
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ) → ((𝐴‘𝑗) − (𝐶‘𝑗)) ∈ ℂ) |
60 | 59 | 3adant3 1074 |
. . . . . . 7
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((𝐴‘𝑗) − (𝐶‘𝑗)) ∈ ℂ) |
61 | 58, 60 | sqmuld 12882 |
. . . . . 6
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → ((𝑇 · ((𝐴‘𝑗) − (𝐶‘𝑗)))↑2) = ((𝑇↑2) · (((𝐴‘𝑗) − (𝐶‘𝑗))↑2))) |
62 | 57, 61 | eqtrd 2644 |
. . . . 5
⊢ (((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) → (((𝐴‘𝑗) − (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗))))↑2) = ((𝑇↑2) · (((𝐴‘𝑗) − (𝐶‘𝑗))↑2))) |
63 | 26, 62 | sylan9eqr 2666 |
. . . 4
⊢ ((((𝐴‘𝑗) ∈ ℂ ∧ (𝐶‘𝑗) ∈ ℂ ∧ 𝑇 ∈ ℂ) ∧ (𝐵‘𝑗) = (((1 − 𝑇) · (𝐴‘𝑗)) + (𝑇 · (𝐶‘𝑗)))) → (((𝐴‘𝑗) − (𝐵‘𝑗))↑2) = ((𝑇↑2) · (((𝐴‘𝑗) − (𝐶‘𝑗))↑2))) |
64 | 3, 6, 14, 24, 63 | syl31anc 1321 |
. . 3
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) ∧ 𝑗 ∈ (1...𝑁)) → (((𝐴‘𝑗) − (𝐵‘𝑗))↑2) = ((𝑇↑2) · (((𝐴‘𝑗) − (𝐶‘𝑗))↑2))) |
65 | 64 | sumeq2dv 14281 |
. 2
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) → Σ𝑗 ∈ (1...𝑁)(((𝐴‘𝑗) − (𝐵‘𝑗))↑2) = Σ𝑗 ∈ (1...𝑁)((𝑇↑2) · (((𝐴‘𝑗) − (𝐶‘𝑗))↑2))) |
66 | | fzfid 12634 |
. . 3
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) → (1...𝑁) ∈ Fin) |
67 | 10 | resqcld 12897 |
. . . . . 6
⊢ (𝑇 ∈ (0[,]1) → (𝑇↑2) ∈
ℝ) |
68 | 67 | recnd 9947 |
. . . . 5
⊢ (𝑇 ∈ (0[,]1) → (𝑇↑2) ∈
ℂ) |
69 | 68 | adantr 480 |
. . . 4
⊢ ((𝑇 ∈ (0[,]1) ∧
∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖)))) → (𝑇↑2) ∈ ℂ) |
70 | 69 | 3ad2ant3 1077 |
. . 3
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) → (𝑇↑2) ∈ ℂ) |
71 | 2 | 3adant1 1072 |
. . . . . . . 8
⊢ ((𝑁 ∈ ℕ ∧ 𝐴 ∈ (𝔼‘𝑁) ∧ 𝑗 ∈ (1...𝑁)) → (𝐴‘𝑗) ∈ ℂ) |
72 | 71 | 3adant2r 1313 |
. . . . . . 7
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ 𝑗 ∈ (1...𝑁)) → (𝐴‘𝑗) ∈ ℂ) |
73 | 5 | 3adant1 1072 |
. . . . . . . 8
⊢ ((𝑁 ∈ ℕ ∧ 𝐶 ∈ (𝔼‘𝑁) ∧ 𝑗 ∈ (1...𝑁)) → (𝐶‘𝑗) ∈ ℂ) |
74 | 73 | 3adant2l 1312 |
. . . . . . 7
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ 𝑗 ∈ (1...𝑁)) → (𝐶‘𝑗) ∈ ℂ) |
75 | 72, 74, 59 | syl2anc 691 |
. . . . . 6
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ 𝑗 ∈ (1...𝑁)) → ((𝐴‘𝑗) − (𝐶‘𝑗)) ∈ ℂ) |
76 | 75 | sqcld 12868 |
. . . . 5
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ 𝑗 ∈ (1...𝑁)) → (((𝐴‘𝑗) − (𝐶‘𝑗))↑2) ∈ ℂ) |
77 | 76 | 3expa 1257 |
. . . 4
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁))) ∧ 𝑗 ∈ (1...𝑁)) → (((𝐴‘𝑗) − (𝐶‘𝑗))↑2) ∈ ℂ) |
78 | 77 | 3adantl3 1212 |
. . 3
⊢ (((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) ∧ 𝑗 ∈ (1...𝑁)) → (((𝐴‘𝑗) − (𝐶‘𝑗))↑2) ∈ ℂ) |
79 | 66, 70, 78 | fsummulc2 14358 |
. 2
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) → ((𝑇↑2) · Σ𝑗 ∈ (1...𝑁)(((𝐴‘𝑗) − (𝐶‘𝑗))↑2)) = Σ𝑗 ∈ (1...𝑁)((𝑇↑2) · (((𝐴‘𝑗) − (𝐶‘𝑗))↑2))) |
80 | 65, 79 | eqtr4d 2647 |
1
⊢ ((𝑁 ∈ ℕ ∧ (𝐴 ∈ (𝔼‘𝑁) ∧ 𝐶 ∈ (𝔼‘𝑁)) ∧ (𝑇 ∈ (0[,]1) ∧ ∀𝑖 ∈ (1...𝑁)(𝐵‘𝑖) = (((1 − 𝑇) · (𝐴‘𝑖)) + (𝑇 · (𝐶‘𝑖))))) → Σ𝑗 ∈ (1...𝑁)(((𝐴‘𝑗) − (𝐵‘𝑗))↑2) = ((𝑇↑2) · Σ𝑗 ∈ (1...𝑁)(((𝐴‘𝑗) − (𝐶‘𝑗))↑2))) |