Proof of Theorem crosspdotsumlem
| Step | Hyp | Ref
| Expression |
| 1 | | crosspdotd.1 |
. . 3
⊢ (𝜑 → 𝐴 ∈ (ℝ ↑m
(1...3))) |
| 2 | | crosspdotd.2 |
. . 3
⊢ (𝜑 → 𝐵 ∈ (ℝ ↑m
(1...3))) |
| 3 | | crosspdotd.3 |
. . 3
⊢ (𝜑 → 𝐶 ∈ (ℝ ↑m
(1...3))) |
| 4 | 1, 2, 3 | 3jca 1146 |
. 2
⊢ (𝜑 → (𝐴 ∈ (ℝ ↑m (1...3))
∧ 𝐵 ∈ (ℝ
↑m (1...3)) ∧ 𝐶 ∈ (ℝ ↑m
(1...3)))) |
| 5 | | df-refld 21805 |
. . . . 5
⊢
ℝfld = (ℂfld ↾s
ℝ) |
| 6 | 5 | oveq1i 7429 |
. . . 4
⊢
(ℝfld Σg (𝑘 ∈ (1...3) ↦ ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)))) = ((ℂfld
↾s ℝ) Σg (𝑘 ∈ (1...3) ↦ ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)))) |
| 7 | 6 | a1i 11 |
. . 3
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (ℝfld
Σg (𝑘 ∈ (1...3) ↦ ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)))) = ((ℂfld
↾s ℝ) Σg (𝑘 ∈ (1...3) ↦ ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘))))) |
| 8 | | fzfid 14027 |
. . . 4
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (1...3) ∈ Fin) |
| 9 | | simp1 1154 |
. . . . . . 7
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → 𝐴 ∈ (ℝ ↑m
(1...3))) |
| 10 | | elmapi 8852 |
. . . . . . 7
⊢ (𝐴 ∈ (ℝ
↑m (1...3)) → 𝐴:(1...3)⟶ℝ) |
| 11 | 9, 10 | syl 18 |
. . . . . 6
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → 𝐴:(1...3)⟶ℝ) |
| 12 | 11 | ffvelcdmda 7083 |
. . . . 5
⊢ (((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) ∧ 𝑘 ∈ (1...3)) → (𝐴‘𝑘) ∈ ℝ) |
| 13 | | simp2 1155 |
. . . . . . . 8
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → 𝐵 ∈ (ℝ ↑m
(1...3))) |
| 14 | | simp3 1156 |
. . . . . . . 8
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → 𝐶 ∈ (ℝ ↑m
(1...3))) |
| 15 | 13, 14 | crosspcld 50698 |
. . . . . . 7
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (𝐵⊠𝐶) ∈ (ℝ ↑m
(1...3))) |
| 16 | | elmapi 8852 |
. . . . . . 7
⊢ ((𝐵⊠𝐶) ∈ (ℝ ↑m
(1...3)) → (𝐵⊠𝐶):(1...3)⟶ℝ) |
| 17 | 15, 16 | syl 18 |
. . . . . 6
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (𝐵⊠𝐶):(1...3)⟶ℝ) |
| 18 | 17 | ffvelcdmda 7083 |
. . . . 5
⊢ (((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) ∧ 𝑘 ∈ (1...3)) → ((𝐵⊠𝐶)‘𝑘) ∈ ℝ) |
| 19 | 12, 18 | remulcld 11254 |
. . . 4
⊢ (((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) ∧ 𝑘 ∈ (1...3)) → ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) ∈ ℝ) |
| 20 | 8, 19 | regsumfsum 21635 |
. . 3
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((ℂfld ↾s
ℝ) Σg (𝑘 ∈ (1...3) ↦ ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)))) = Σ𝑘 ∈ (1...3)((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘))) |
| 21 | | 1p2e3 12398 |
. . . . . . . . 9
⊢ (1 + 2) =
3 |
| 22 | 21 | eqcomi 2774 |
. . . . . . . 8
⊢ 3 = (1 +
2) |
| 23 | 22 | oveq2i 7430 |
. . . . . . 7
⊢ (1...3) =
(1...(1 + 2)) |
| 24 | | 1z 12639 |
. . . . . . . 8
⊢ 1 ∈
ℤ |
| 25 | | fztp 13625 |
. . . . . . . 8
⊢ (1 ∈
ℤ → (1...(1 + 2)) = {1, (1 + 1), (1 + 2)}) |
| 26 | 24, 25 | ax-mp 5 |
. . . . . . 7
⊢ (1...(1 +
2)) = {1, (1 + 1), (1 + 2)} |
| 27 | 23, 26 | eqtri 2788 |
. . . . . 6
⊢ (1...3) =
{1, (1 + 1), (1 + 2)} |
| 28 | 27 | sumeq1i 15772 |
. . . . 5
⊢
Σ𝑘 ∈
(1...3)((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = Σ𝑘 ∈ {1, (1 + 1), (1 + 2)} ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) |
| 29 | 28 | a1i 11 |
. . . 4
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → Σ𝑘 ∈ (1...3)((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = Σ𝑘 ∈ {1, (1 + 1), (1 + 2)} ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘))) |
| 30 | | eqidd 2766 |
. . . . . . . 8
⊢ (1 ∈
ℤ → 1 = 1) |
| 31 | | 1p1e2 12379 |
. . . . . . . . 9
⊢ (1 + 1) =
2 |
| 32 | 31 | a1i 11 |
. . . . . . . 8
⊢ (1 ∈
ℤ → (1 + 1) = 2) |
| 33 | 21 | a1i 11 |
. . . . . . . 8
⊢ (1 ∈
ℤ → (1 + 2) = 3) |
| 34 | 30, 32, 33 | tpeq123d 4716 |
. . . . . . 7
⊢ (1 ∈
ℤ → {1, (1 + 1), (1 + 2)} = {1, 2, 3}) |
| 35 | 24, 34 | ax-mp 5 |
. . . . . 6
⊢ {1, (1 +
1), (1 + 2)} = {1, 2, 3} |
| 36 | 35 | sumeq1i 15772 |
. . . . 5
⊢
Σ𝑘 ∈ {1,
(1 + 1), (1 + 2)} ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = Σ𝑘 ∈ {1, 2, 3} ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) |
| 37 | 36 | a1i 11 |
. . . 4
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → Σ𝑘 ∈ {1, (1 + 1), (1 + 2)} ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = Σ𝑘 ∈ {1, 2, 3} ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘))) |
| 38 | | fveq2 6885 |
. . . . . . 7
⊢ (𝑘 = 1 → (𝐴‘𝑘) = (𝐴‘1)) |
| 39 | | fveq2 6885 |
. . . . . . 7
⊢ (𝑘 = 1 → ((𝐵⊠𝐶)‘𝑘) = ((𝐵⊠𝐶)‘1)) |
| 40 | 38, 39 | oveq12d 7437 |
. . . . . 6
⊢ (𝑘 = 1 → ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = ((𝐴‘1) · ((𝐵⊠𝐶)‘1))) |
| 41 | | fveq2 6885 |
. . . . . . 7
⊢ (𝑘 = 2 → (𝐴‘𝑘) = (𝐴‘2)) |
| 42 | | fveq2 6885 |
. . . . . . 7
⊢ (𝑘 = 2 → ((𝐵⊠𝐶)‘𝑘) = ((𝐵⊠𝐶)‘2)) |
| 43 | 41, 42 | oveq12d 7437 |
. . . . . 6
⊢ (𝑘 = 2 → ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = ((𝐴‘2) · ((𝐵⊠𝐶)‘2))) |
| 44 | | fveq2 6885 |
. . . . . . 7
⊢ (𝑘 = 3 → (𝐴‘𝑘) = (𝐴‘3)) |
| 45 | | fveq2 6885 |
. . . . . . 7
⊢ (𝑘 = 3 → ((𝐵⊠𝐶)‘𝑘) = ((𝐵⊠𝐶)‘3)) |
| 46 | 44, 45 | oveq12d 7437 |
. . . . . 6
⊢ (𝑘 = 3 → ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = ((𝐴‘3) · ((𝐵⊠𝐶)‘3))) |
| 47 | 9 | rr3fv1cld 50686 |
. . . . . . . . 9
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (𝐴‘1) ∈ ℝ) |
| 48 | 15 | rr3fv1cld 50686 |
. . . . . . . . 9
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐵⊠𝐶)‘1) ∈ ℝ) |
| 49 | 47, 48 | remulcld 11254 |
. . . . . . . 8
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐴‘1) · ((𝐵⊠𝐶)‘1)) ∈ ℝ) |
| 50 | 49 | recnd 11252 |
. . . . . . 7
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐴‘1) · ((𝐵⊠𝐶)‘1)) ∈ ℂ) |
| 51 | 9 | rr3fv2cld 50687 |
. . . . . . . . 9
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (𝐴‘2) ∈ ℝ) |
| 52 | 15 | rr3fv2cld 50687 |
. . . . . . . . 9
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐵⊠𝐶)‘2) ∈ ℝ) |
| 53 | 51, 52 | remulcld 11254 |
. . . . . . . 8
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐴‘2) · ((𝐵⊠𝐶)‘2)) ∈ ℝ) |
| 54 | 53 | recnd 11252 |
. . . . . . 7
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐴‘2) · ((𝐵⊠𝐶)‘2)) ∈ ℂ) |
| 55 | 9 | rr3fv3cld 50688 |
. . . . . . . . 9
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (𝐴‘3) ∈ ℝ) |
| 56 | 15 | rr3fv3cld 50688 |
. . . . . . . . 9
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐵⊠𝐶)‘3) ∈ ℝ) |
| 57 | 55, 56 | remulcld 11254 |
. . . . . . . 8
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐴‘3) · ((𝐵⊠𝐶)‘3)) ∈ ℝ) |
| 58 | 57 | recnd 11252 |
. . . . . . 7
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((𝐴‘3) · ((𝐵⊠𝐶)‘3)) ∈ ℂ) |
| 59 | 50, 54, 58 | 3jca 1146 |
. . . . . 6
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (((𝐴‘1) · ((𝐵⊠𝐶)‘1)) ∈ ℂ ∧ ((𝐴‘2) · ((𝐵⊠𝐶)‘2)) ∈ ℂ ∧ ((𝐴‘3) · ((𝐵⊠𝐶)‘3)) ∈
ℂ)) |
| 60 | | 2z 12641 |
. . . . . . . 8
⊢ 2 ∈
ℤ |
| 61 | | 3z 12642 |
. . . . . . . 8
⊢ 3 ∈
ℤ |
| 62 | 24, 60, 61 | 3pm3.2i 1358 |
. . . . . . 7
⊢ (1 ∈
ℤ ∧ 2 ∈ ℤ ∧ 3 ∈ ℤ) |
| 63 | 62 | a1i 11 |
. . . . . 6
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (1 ∈ ℤ ∧ 2 ∈ ℤ
∧ 3 ∈ ℤ)) |
| 64 | | 1ne2 12466 |
. . . . . . 7
⊢ 1 ≠
2 |
| 65 | 64 | a1i 11 |
. . . . . 6
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → 1 ≠ 2) |
| 66 | | 1ne3 50680 |
. . . . . . 7
⊢ 1 ≠
3 |
| 67 | 66 | a1i 11 |
. . . . . 6
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → 1 ≠ 3) |
| 68 | | 2ne3 50681 |
. . . . . . 7
⊢ 2 ≠
3 |
| 69 | 68 | a1i 11 |
. . . . . 6
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → 2 ≠ 3) |
| 70 | 40, 43, 46, 59, 63, 65, 67, 69 | sumtp 15823 |
. . . . 5
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → Σ𝑘 ∈ {1, 2, 3} ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = ((((𝐴‘1) · ((𝐵⊠𝐶)‘1)) + ((𝐴‘2) · ((𝐵⊠𝐶)‘2))) + ((𝐴‘3) · ((𝐵⊠𝐶)‘3)))) |
| 71 | 50, 54, 58 | addassd 11246 |
. . . . 5
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → ((((𝐴‘1) · ((𝐵⊠𝐶)‘1)) + ((𝐴‘2) · ((𝐵⊠𝐶)‘2))) + ((𝐴‘3) · ((𝐵⊠𝐶)‘3))) = (((𝐴‘1) · ((𝐵⊠𝐶)‘1)) + (((𝐴‘2) · ((𝐵⊠𝐶)‘2)) + ((𝐴‘3) · ((𝐵⊠𝐶)‘3))))) |
| 72 | 70, 71 | eqtrd 2800 |
. . . 4
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → Σ𝑘 ∈ {1, 2, 3} ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = (((𝐴‘1) · ((𝐵⊠𝐶)‘1)) + (((𝐴‘2) · ((𝐵⊠𝐶)‘2)) + ((𝐴‘3) · ((𝐵⊠𝐶)‘3))))) |
| 73 | 29, 37, 72 | 3eqtrd 2804 |
. . 3
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → Σ𝑘 ∈ (1...3)((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)) = (((𝐴‘1) · ((𝐵⊠𝐶)‘1)) + (((𝐴‘2) · ((𝐵⊠𝐶)‘2)) + ((𝐴‘3) · ((𝐵⊠𝐶)‘3))))) |
| 74 | 7, 20, 73 | 3eqtrd 2804 |
. 2
⊢ ((𝐴 ∈ (ℝ
↑m (1...3)) ∧ 𝐵 ∈ (ℝ ↑m (1...3))
∧ 𝐶 ∈ (ℝ
↑m (1...3))) → (ℝfld
Σg (𝑘 ∈ (1...3) ↦ ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)))) = (((𝐴‘1) · ((𝐵⊠𝐶)‘1)) + (((𝐴‘2) · ((𝐵⊠𝐶)‘2)) + ((𝐴‘3) · ((𝐵⊠𝐶)‘3))))) |
| 75 | 4, 74 | syl 18 |
1
⊢ (𝜑 → (ℝfld
Σg (𝑘 ∈ (1...3) ↦ ((𝐴‘𝑘) · ((𝐵⊠𝐶)‘𝑘)))) = (((𝐴‘1) · ((𝐵⊠𝐶)‘1)) + (((𝐴‘2) · ((𝐵⊠𝐶)‘2)) + ((𝐴‘3) · ((𝐵⊠𝐶)‘3))))) |