| Step | Hyp | Ref
 | Expression | 
| 1 |   | binomlem.4 | 
. . . . . 6
⊢ (𝜓 → ((𝐴 + 𝐵)↑𝑁) = Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘)))) | 
| 2 | 1 | adantl 277 | 
. . . . 5
⊢ ((𝜑 ∧ 𝜓) → ((𝐴 + 𝐵)↑𝑁) = Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘)))) | 
| 3 | 2 | oveq1d 5937 | 
. . . 4
⊢ ((𝜑 ∧ 𝜓) → (((𝐴 + 𝐵)↑𝑁) · 𝐴) = (Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐴)) | 
| 4 |   | 0zd 9338 | 
. . . . . . . 8
⊢ (𝜑 → 0 ∈
ℤ) | 
| 5 |   | binomlem.3 | 
. . . . . . . . 9
⊢ (𝜑 → 𝑁 ∈
ℕ0) | 
| 6 | 5 | nn0zd 9446 | 
. . . . . . . 8
⊢ (𝜑 → 𝑁 ∈ ℤ) | 
| 7 | 4, 6 | fzfigd 10523 | 
. . . . . . 7
⊢ (𝜑 → (0...𝑁) ∈ Fin) | 
| 8 |   | binomlem.1 | 
. . . . . . 7
⊢ (𝜑 → 𝐴 ∈ ℂ) | 
| 9 |   | fzelp1 10149 | 
. . . . . . . . 9
⊢ (𝑘 ∈ (0...𝑁) → 𝑘 ∈ (0...(𝑁 + 1))) | 
| 10 |   | elfzelz 10100 | 
. . . . . . . . . . 11
⊢ (𝑘 ∈ (0...(𝑁 + 1)) → 𝑘 ∈ ℤ) | 
| 11 |   | bccl 10859 | 
. . . . . . . . . . 11
⊢ ((𝑁 ∈ ℕ0
∧ 𝑘 ∈ ℤ)
→ (𝑁C𝑘) ∈
ℕ0) | 
| 12 | 5, 10, 11 | syl2an 289 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (𝑁C𝑘) ∈
ℕ0) | 
| 13 | 12 | nn0cnd 9304 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (𝑁C𝑘) ∈ ℂ) | 
| 14 | 9, 13 | sylan2 286 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (𝑁C𝑘) ∈ ℂ) | 
| 15 |   | fznn0sub 10132 | 
. . . . . . . . . 10
⊢ (𝑘 ∈ (0...𝑁) → (𝑁 − 𝑘) ∈
ℕ0) | 
| 16 |   | expcl 10649 | 
. . . . . . . . . 10
⊢ ((𝐴 ∈ ℂ ∧ (𝑁 − 𝑘) ∈ ℕ0) → (𝐴↑(𝑁 − 𝑘)) ∈ ℂ) | 
| 17 | 8, 15, 16 | syl2an 289 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (𝐴↑(𝑁 − 𝑘)) ∈ ℂ) | 
| 18 |   | binomlem.2 | 
. . . . . . . . . . 11
⊢ (𝜑 → 𝐵 ∈ ℂ) | 
| 19 |   | elfznn0 10189 | 
. . . . . . . . . . 11
⊢ (𝑘 ∈ (0...(𝑁 + 1)) → 𝑘 ∈ ℕ0) | 
| 20 |   | expcl 10649 | 
. . . . . . . . . . 11
⊢ ((𝐵 ∈ ℂ ∧ 𝑘 ∈ ℕ0)
→ (𝐵↑𝑘) ∈
ℂ) | 
| 21 | 18, 19, 20 | syl2an 289 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (𝐵↑𝑘) ∈ ℂ) | 
| 22 | 9, 21 | sylan2 286 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (𝐵↑𝑘) ∈ ℂ) | 
| 23 | 17, 22 | mulcld 8047 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘)) ∈ ℂ) | 
| 24 | 14, 23 | mulcld 8047 | 
. . . . . . 7
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) ∈ ℂ) | 
| 25 | 7, 8, 24 | fsummulc1 11614 | 
. . . . . 6
⊢ (𝜑 → (Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐴) = Σ𝑘 ∈ (0...𝑁)(((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐴)) | 
| 26 | 8 | adantr 276 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝐴 ∈ ℂ) | 
| 27 | 14, 23, 26 | mulassd 8050 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐴) = ((𝑁C𝑘) · (((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘)) · 𝐴))) | 
| 28 | 5 | nn0cnd 9304 | 
. . . . . . . . . . . . . . 15
⊢ (𝜑 → 𝑁 ∈ ℂ) | 
| 29 | 28 | adantr 276 | 
. . . . . . . . . . . . . 14
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝑁 ∈ ℂ) | 
| 30 |   | 1cnd 8042 | 
. . . . . . . . . . . . . 14
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 1 ∈ ℂ) | 
| 31 |   | elfzelz 10100 | 
. . . . . . . . . . . . . . . 16
⊢ (𝑘 ∈ (0...𝑁) → 𝑘 ∈ ℤ) | 
| 32 | 31 | adantl 277 | 
. . . . . . . . . . . . . . 15
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝑘 ∈ ℤ) | 
| 33 | 32 | zcnd 9449 | 
. . . . . . . . . . . . . 14
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝑘 ∈ ℂ) | 
| 34 | 29, 30, 33 | addsubd 8358 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑁 + 1) − 𝑘) = ((𝑁 − 𝑘) + 1)) | 
| 35 | 34 | oveq2d 5938 | 
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (𝐴↑((𝑁 + 1) − 𝑘)) = (𝐴↑((𝑁 − 𝑘) + 1))) | 
| 36 |   | expp1 10638 | 
. . . . . . . . . . . . 13
⊢ ((𝐴 ∈ ℂ ∧ (𝑁 − 𝑘) ∈ ℕ0) → (𝐴↑((𝑁 − 𝑘) + 1)) = ((𝐴↑(𝑁 − 𝑘)) · 𝐴)) | 
| 37 | 8, 15, 36 | syl2an 289 | 
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (𝐴↑((𝑁 − 𝑘) + 1)) = ((𝐴↑(𝑁 − 𝑘)) · 𝐴)) | 
| 38 | 35, 37 | eqtrd 2229 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (𝐴↑((𝑁 + 1) − 𝑘)) = ((𝐴↑(𝑁 − 𝑘)) · 𝐴)) | 
| 39 | 38 | oveq1d 5937 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)) = (((𝐴↑(𝑁 − 𝑘)) · 𝐴) · (𝐵↑𝑘))) | 
| 40 | 17, 26, 22 | mul32d 8179 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((𝐴↑(𝑁 − 𝑘)) · 𝐴) · (𝐵↑𝑘)) = (((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘)) · 𝐴)) | 
| 41 | 39, 40 | eqtrd 2229 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)) = (((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘)) · 𝐴)) | 
| 42 | 41 | oveq2d 5938 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = ((𝑁C𝑘) · (((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘)) · 𝐴))) | 
| 43 | 27, 42 | eqtr4d 2232 | 
. . . . . . 7
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐴) = ((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 44 | 43 | sumeq2dv 11533 | 
. . . . . 6
⊢ (𝜑 → Σ𝑘 ∈ (0...𝑁)(((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐴) = Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 45 |   | fzssp1 10142 | 
. . . . . . . 8
⊢
(0...𝑁) ⊆
(0...(𝑁 +
1)) | 
| 46 | 45 | a1i 9 | 
. . . . . . 7
⊢ (𝜑 → (0...𝑁) ⊆ (0...(𝑁 + 1))) | 
| 47 |   | fznn0sub 10132 | 
. . . . . . . . . . 11
⊢ (𝑘 ∈ (0...(𝑁 + 1)) → ((𝑁 + 1) − 𝑘) ∈
ℕ0) | 
| 48 |   | expcl 10649 | 
. . . . . . . . . . 11
⊢ ((𝐴 ∈ ℂ ∧ ((𝑁 + 1) − 𝑘) ∈ ℕ0) → (𝐴↑((𝑁 + 1) − 𝑘)) ∈ ℂ) | 
| 49 | 8, 47, 48 | syl2an 289 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (𝐴↑((𝑁 + 1) − 𝑘)) ∈ ℂ) | 
| 50 | 49, 21 | mulcld 8047 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)) ∈ ℂ) | 
| 51 | 13, 50 | mulcld 8047 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → ((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) ∈ ℂ) | 
| 52 | 9, 51 | sylan2 286 | 
. . . . . . 7
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → ((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) ∈ ℂ) | 
| 53 | 5 | adantr 276 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁))) → 𝑁 ∈
ℕ0) | 
| 54 |   | eldifi 3285 | 
. . . . . . . . . . . 12
⊢ (𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁)) → 𝑘 ∈ (0...(𝑁 + 1))) | 
| 55 | 54, 10 | syl 14 | 
. . . . . . . . . . 11
⊢ (𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁)) → 𝑘 ∈ ℤ) | 
| 56 | 55 | adantl 277 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁))) → 𝑘 ∈ ℤ) | 
| 57 |   | eldifn 3286 | 
. . . . . . . . . . 11
⊢ (𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁)) → ¬ 𝑘 ∈ (0...𝑁)) | 
| 58 | 57 | adantl 277 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁))) → ¬ 𝑘 ∈ (0...𝑁)) | 
| 59 |   | bcval3 10843 | 
. . . . . . . . . 10
⊢ ((𝑁 ∈ ℕ0
∧ 𝑘 ∈ ℤ
∧ ¬ 𝑘 ∈
(0...𝑁)) → (𝑁C𝑘) = 0) | 
| 60 | 53, 56, 58, 59 | syl3anc 1249 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁))) → (𝑁C𝑘) = 0) | 
| 61 | 60 | oveq1d 5937 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁))) → ((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = (0 · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 62 | 50 | mul02d 8418 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (0 · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = 0) | 
| 63 | 54, 62 | sylan2 286 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁))) → (0 · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = 0) | 
| 64 | 61, 63 | eqtrd 2229 | 
. . . . . . 7
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ (0...𝑁))) → ((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = 0) | 
| 65 |   | eluzelz 9610 | 
. . . . . . . . . 10
⊢ (𝑛 ∈
(ℤ≥‘0) → 𝑛 ∈ ℤ) | 
| 66 | 65 | adantl 277 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑛 ∈ (ℤ≥‘0))
→ 𝑛 ∈
ℤ) | 
| 67 |   | 0zd 9338 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑛 ∈ (ℤ≥‘0))
→ 0 ∈ ℤ) | 
| 68 | 6 | adantr 276 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑛 ∈ (ℤ≥‘0))
→ 𝑁 ∈
ℤ) | 
| 69 |   | fzdcel 10115 | 
. . . . . . . . 9
⊢ ((𝑛 ∈ ℤ ∧ 0 ∈
ℤ ∧ 𝑁 ∈
ℤ) → DECID 𝑛 ∈ (0...𝑁)) | 
| 70 | 66, 67, 68, 69 | syl3anc 1249 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑛 ∈ (ℤ≥‘0))
→ DECID 𝑛 ∈ (0...𝑁)) | 
| 71 | 70 | ralrimiva 2570 | 
. . . . . . 7
⊢ (𝜑 → ∀𝑛 ∈
(ℤ≥‘0)DECID 𝑛 ∈ (0...𝑁)) | 
| 72 |   | fzssuz 10140 | 
. . . . . . . 8
⊢
(0...(𝑁 + 1))
⊆ (ℤ≥‘0) | 
| 73 | 72 | a1i 9 | 
. . . . . . 7
⊢ (𝜑 → (0...(𝑁 + 1)) ⊆
(ℤ≥‘0)) | 
| 74 | 68 | peano2zd 9451 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑛 ∈ (ℤ≥‘0))
→ (𝑁 + 1) ∈
ℤ) | 
| 75 |   | fzdcel 10115 | 
. . . . . . . . 9
⊢ ((𝑛 ∈ ℤ ∧ 0 ∈
ℤ ∧ (𝑁 + 1)
∈ ℤ) → DECID 𝑛 ∈ (0...(𝑁 + 1))) | 
| 76 | 66, 67, 74, 75 | syl3anc 1249 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑛 ∈ (ℤ≥‘0))
→ DECID 𝑛 ∈ (0...(𝑁 + 1))) | 
| 77 | 76 | ralrimiva 2570 | 
. . . . . . 7
⊢ (𝜑 → ∀𝑛 ∈
(ℤ≥‘0)DECID 𝑛 ∈ (0...(𝑁 + 1))) | 
| 78 | 46, 52, 64, 71, 4, 73, 77 | isumss 11556 | 
. . . . . 6
⊢ (𝜑 → Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 79 | 25, 44, 78 | 3eqtrd 2233 | 
. . . . 5
⊢ (𝜑 → (Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐴) = Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 80 | 79 | adantr 276 | 
. . . 4
⊢ ((𝜑 ∧ 𝜓) → (Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐴) = Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 81 | 3, 80 | eqtrd 2229 | 
. . 3
⊢ ((𝜑 ∧ 𝜓) → (((𝐴 + 𝐵)↑𝑁) · 𝐴) = Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 82 | 1 | oveq1d 5937 | 
. . . 4
⊢ (𝜓 → (((𝐴 + 𝐵)↑𝑁) · 𝐵) = (Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵)) | 
| 83 | 7, 18, 24 | fsummulc1 11614 | 
. . . . 5
⊢ (𝜑 → (Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵) = Σ𝑘 ∈ (0...𝑁)(((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵)) | 
| 84 |   | 1zzd 9353 | 
. . . . . . . 8
⊢ (𝜑 → 1 ∈
ℤ) | 
| 85 | 18 | adantr 276 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → 𝐵 ∈ ℂ) | 
| 86 | 24, 85 | mulcld 8047 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ (0...𝑁)) → (((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵) ∈ ℂ) | 
| 87 |   | oveq2 5930 | 
. . . . . . . . . 10
⊢ (𝑘 = (𝑗 − 1) → (𝑁C𝑘) = (𝑁C(𝑗 − 1))) | 
| 88 |   | oveq2 5930 | 
. . . . . . . . . . . 12
⊢ (𝑘 = (𝑗 − 1) → (𝑁 − 𝑘) = (𝑁 − (𝑗 − 1))) | 
| 89 | 88 | oveq2d 5938 | 
. . . . . . . . . . 11
⊢ (𝑘 = (𝑗 − 1) → (𝐴↑(𝑁 − 𝑘)) = (𝐴↑(𝑁 − (𝑗 − 1)))) | 
| 90 |   | oveq2 5930 | 
. . . . . . . . . . 11
⊢ (𝑘 = (𝑗 − 1) → (𝐵↑𝑘) = (𝐵↑(𝑗 − 1))) | 
| 91 | 89, 90 | oveq12d 5940 | 
. . . . . . . . . 10
⊢ (𝑘 = (𝑗 − 1) → ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘)) = ((𝐴↑(𝑁 − (𝑗 − 1))) · (𝐵↑(𝑗 − 1)))) | 
| 92 | 87, 91 | oveq12d 5940 | 
. . . . . . . . 9
⊢ (𝑘 = (𝑗 − 1) → ((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) = ((𝑁C(𝑗 − 1)) · ((𝐴↑(𝑁 − (𝑗 − 1))) · (𝐵↑(𝑗 − 1))))) | 
| 93 | 92 | oveq1d 5937 | 
. . . . . . . 8
⊢ (𝑘 = (𝑗 − 1) → (((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵) = (((𝑁C(𝑗 − 1)) · ((𝐴↑(𝑁 − (𝑗 − 1))) · (𝐵↑(𝑗 − 1)))) · 𝐵)) | 
| 94 | 84, 4, 6, 86, 93 | fsumshft 11609 | 
. . . . . . 7
⊢ (𝜑 → Σ𝑘 ∈ (0...𝑁)(((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵) = Σ𝑗 ∈ ((0 + 1)...(𝑁 + 1))(((𝑁C(𝑗 − 1)) · ((𝐴↑(𝑁 − (𝑗 − 1))) · (𝐵↑(𝑗 − 1)))) · 𝐵)) | 
| 95 |   | oveq1 5929 | 
. . . . . . . . . . 11
⊢ (𝑗 = 𝑘 → (𝑗 − 1) = (𝑘 − 1)) | 
| 96 | 95 | oveq2d 5938 | 
. . . . . . . . . 10
⊢ (𝑗 = 𝑘 → (𝑁C(𝑗 − 1)) = (𝑁C(𝑘 − 1))) | 
| 97 | 95 | oveq2d 5938 | 
. . . . . . . . . . . 12
⊢ (𝑗 = 𝑘 → (𝑁 − (𝑗 − 1)) = (𝑁 − (𝑘 − 1))) | 
| 98 | 97 | oveq2d 5938 | 
. . . . . . . . . . 11
⊢ (𝑗 = 𝑘 → (𝐴↑(𝑁 − (𝑗 − 1))) = (𝐴↑(𝑁 − (𝑘 − 1)))) | 
| 99 | 95 | oveq2d 5938 | 
. . . . . . . . . . 11
⊢ (𝑗 = 𝑘 → (𝐵↑(𝑗 − 1)) = (𝐵↑(𝑘 − 1))) | 
| 100 | 98, 99 | oveq12d 5940 | 
. . . . . . . . . 10
⊢ (𝑗 = 𝑘 → ((𝐴↑(𝑁 − (𝑗 − 1))) · (𝐵↑(𝑗 − 1))) = ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1)))) | 
| 101 | 96, 100 | oveq12d 5940 | 
. . . . . . . . 9
⊢ (𝑗 = 𝑘 → ((𝑁C(𝑗 − 1)) · ((𝐴↑(𝑁 − (𝑗 − 1))) · (𝐵↑(𝑗 − 1)))) = ((𝑁C(𝑘 − 1)) · ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1))))) | 
| 102 | 101 | oveq1d 5937 | 
. . . . . . . 8
⊢ (𝑗 = 𝑘 → (((𝑁C(𝑗 − 1)) · ((𝐴↑(𝑁 − (𝑗 − 1))) · (𝐵↑(𝑗 − 1)))) · 𝐵) = (((𝑁C(𝑘 − 1)) · ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1)))) · 𝐵)) | 
| 103 | 102 | cbvsumv 11526 | 
. . . . . . 7
⊢
Σ𝑗 ∈ ((0
+ 1)...(𝑁 + 1))(((𝑁C(𝑗 − 1)) · ((𝐴↑(𝑁 − (𝑗 − 1))) · (𝐵↑(𝑗 − 1)))) · 𝐵) = Σ𝑘 ∈ ((0 + 1)...(𝑁 + 1))(((𝑁C(𝑘 − 1)) · ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1)))) · 𝐵) | 
| 104 | 94, 103 | eqtrdi 2245 | 
. . . . . 6
⊢ (𝜑 → Σ𝑘 ∈ (0...𝑁)(((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵) = Σ𝑘 ∈ ((0 + 1)...(𝑁 + 1))(((𝑁C(𝑘 − 1)) · ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1)))) · 𝐵)) | 
| 105 | 28 | adantr 276 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → 𝑁 ∈ ℂ) | 
| 106 |   | elfzelz 10100 | 
. . . . . . . . . . . . . . 15
⊢ (𝑘 ∈ ((0 + 1)...(𝑁 + 1)) → 𝑘 ∈ ℤ) | 
| 107 | 106 | adantl 277 | 
. . . . . . . . . . . . . 14
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → 𝑘 ∈ ℤ) | 
| 108 | 107 | zcnd 9449 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → 𝑘 ∈ ℂ) | 
| 109 |   | 1cnd 8042 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → 1 ∈
ℂ) | 
| 110 | 105, 108,
109 | subsub3d 8367 | 
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (𝑁 − (𝑘 − 1)) = ((𝑁 + 1) − 𝑘)) | 
| 111 | 110 | oveq2d 5938 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (𝐴↑(𝑁 − (𝑘 − 1))) = (𝐴↑((𝑁 + 1) − 𝑘))) | 
| 112 | 111 | oveq1d 5937 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1))) = ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1)))) | 
| 113 | 112 | oveq2d 5938 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → ((𝑁C(𝑘 − 1)) · ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1)))) = ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1))))) | 
| 114 | 113 | oveq1d 5937 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (((𝑁C(𝑘 − 1)) · ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1)))) · 𝐵) = (((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1)))) · 𝐵)) | 
| 115 |   | 0z 9337 | 
. . . . . . . . . . . 12
⊢ 0 ∈
ℤ | 
| 116 |   | fzp1ss 10148 | 
. . . . . . . . . . . 12
⊢ (0 ∈
ℤ → ((0 + 1)...(𝑁 + 1)) ⊆ (0...(𝑁 + 1))) | 
| 117 | 115, 116 | ax-mp 5 | 
. . . . . . . . . . 11
⊢ ((0 +
1)...(𝑁 + 1)) ⊆
(0...(𝑁 +
1)) | 
| 118 | 117 | sseli 3179 | 
. . . . . . . . . 10
⊢ (𝑘 ∈ ((0 + 1)...(𝑁 + 1)) → 𝑘 ∈ (0...(𝑁 + 1))) | 
| 119 | 10 | adantl 277 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → 𝑘 ∈ ℤ) | 
| 120 |   | peano2zm 9364 | 
. . . . . . . . . . . . 13
⊢ (𝑘 ∈ ℤ → (𝑘 − 1) ∈
ℤ) | 
| 121 | 119, 120 | syl 14 | 
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (𝑘 − 1) ∈ ℤ) | 
| 122 |   | bccl 10859 | 
. . . . . . . . . . . 12
⊢ ((𝑁 ∈ ℕ0
∧ (𝑘 − 1) ∈
ℤ) → (𝑁C(𝑘 − 1)) ∈
ℕ0) | 
| 123 | 5, 121, 122 | syl2an2r 595 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (𝑁C(𝑘 − 1)) ∈
ℕ0) | 
| 124 | 123 | nn0cnd 9304 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (𝑁C(𝑘 − 1)) ∈ ℂ) | 
| 125 | 118, 124 | sylan2 286 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (𝑁C(𝑘 − 1)) ∈ ℂ) | 
| 126 | 118, 49 | sylan2 286 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (𝐴↑((𝑁 + 1) − 𝑘)) ∈ ℂ) | 
| 127 | 18 | adantr 276 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → 𝐵 ∈ ℂ) | 
| 128 |   | elfznn 10129 | 
. . . . . . . . . . . . . 14
⊢ (𝑘 ∈ (1...(𝑁 + 1)) → 𝑘 ∈ ℕ) | 
| 129 |   | 0p1e1 9104 | 
. . . . . . . . . . . . . . 15
⊢ (0 + 1) =
1 | 
| 130 | 129 | oveq1i 5932 | 
. . . . . . . . . . . . . 14
⊢ ((0 +
1)...(𝑁 + 1)) = (1...(𝑁 + 1)) | 
| 131 | 128, 130 | eleq2s 2291 | 
. . . . . . . . . . . . 13
⊢ (𝑘 ∈ ((0 + 1)...(𝑁 + 1)) → 𝑘 ∈ ℕ) | 
| 132 | 131 | adantl 277 | 
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → 𝑘 ∈ ℕ) | 
| 133 |   | nnm1nn0 9290 | 
. . . . . . . . . . . 12
⊢ (𝑘 ∈ ℕ → (𝑘 − 1) ∈
ℕ0) | 
| 134 | 132, 133 | syl 14 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (𝑘 − 1) ∈
ℕ0) | 
| 135 | 127, 134 | expcld 10765 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (𝐵↑(𝑘 − 1)) ∈ ℂ) | 
| 136 | 126, 135 | mulcld 8047 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1))) ∈
ℂ) | 
| 137 | 125, 136,
127 | mulassd 8050 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1)))) · 𝐵) = ((𝑁C(𝑘 − 1)) · (((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1))) · 𝐵))) | 
| 138 | 126, 135,
127 | mulassd 8050 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1))) · 𝐵) = ((𝐴↑((𝑁 + 1) − 𝑘)) · ((𝐵↑(𝑘 − 1)) · 𝐵))) | 
| 139 |   | expm1t 10659 | 
. . . . . . . . . . . 12
⊢ ((𝐵 ∈ ℂ ∧ 𝑘 ∈ ℕ) → (𝐵↑𝑘) = ((𝐵↑(𝑘 − 1)) · 𝐵)) | 
| 140 | 18, 131, 139 | syl2an 289 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (𝐵↑𝑘) = ((𝐵↑(𝑘 − 1)) · 𝐵)) | 
| 141 | 140 | oveq2d 5938 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)) = ((𝐴↑((𝑁 + 1) − 𝑘)) · ((𝐵↑(𝑘 − 1)) · 𝐵))) | 
| 142 | 138, 141 | eqtr4d 2232 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1))) · 𝐵) = ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) | 
| 143 | 142 | oveq2d 5938 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → ((𝑁C(𝑘 − 1)) · (((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑(𝑘 − 1))) · 𝐵)) = ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 144 | 114, 137,
143 | 3eqtrd 2233 | 
. . . . . . 7
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → (((𝑁C(𝑘 − 1)) · ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1)))) · 𝐵) = ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 145 | 144 | sumeq2dv 11533 | 
. . . . . 6
⊢ (𝜑 → Σ𝑘 ∈ ((0 + 1)...(𝑁 + 1))(((𝑁C(𝑘 − 1)) · ((𝐴↑(𝑁 − (𝑘 − 1))) · (𝐵↑(𝑘 − 1)))) · 𝐵) = Σ𝑘 ∈ ((0 + 1)...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 146 | 117 | a1i 9 | 
. . . . . . 7
⊢ (𝜑 → ((0 + 1)...(𝑁 + 1)) ⊆ (0...(𝑁 + 1))) | 
| 147 | 124, 50 | mulcld 8047 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) ∈ ℂ) | 
| 148 | 118, 147 | sylan2 286 | 
. . . . . . 7
⊢ ((𝜑 ∧ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) → ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) ∈ ℂ) | 
| 149 | 5 | adantr 276 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → 𝑁 ∈
ℕ0) | 
| 150 |   | eldifi 3285 | 
. . . . . . . . . . . . 13
⊢ (𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1))) → 𝑘 ∈ (0...(𝑁 + 1))) | 
| 151 | 150 | adantl 277 | 
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → 𝑘 ∈ (0...(𝑁 + 1))) | 
| 152 | 151, 10 | syl 14 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → 𝑘 ∈ ℤ) | 
| 153 | 152, 120 | syl 14 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → (𝑘 − 1) ∈ ℤ) | 
| 154 |   | eldifn 3286 | 
. . . . . . . . . . . 12
⊢ (𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1))) → ¬ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) | 
| 155 | 154 | adantl 277 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → ¬ 𝑘 ∈ ((0 + 1)...(𝑁 + 1))) | 
| 156 |   | 0zd 9338 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → 0 ∈
ℤ) | 
| 157 | 149 | nn0zd 9446 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → 𝑁 ∈ ℤ) | 
| 158 |   | 1zzd 9353 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → 1 ∈
ℤ) | 
| 159 |   | fzaddel 10134 | 
. . . . . . . . . . . . 13
⊢ (((0
∈ ℤ ∧ 𝑁
∈ ℤ) ∧ ((𝑘
− 1) ∈ ℤ ∧ 1 ∈ ℤ)) → ((𝑘 − 1) ∈ (0...𝑁) ↔ ((𝑘 − 1) + 1) ∈ ((0 + 1)...(𝑁 + 1)))) | 
| 160 | 156, 157,
153, 158, 159 | syl22anc 1250 | 
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → ((𝑘 − 1) ∈ (0...𝑁) ↔ ((𝑘 − 1) + 1) ∈ ((0 + 1)...(𝑁 + 1)))) | 
| 161 | 152 | zcnd 9449 | 
. . . . . . . . . . . . . 14
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → 𝑘 ∈ ℂ) | 
| 162 |   | ax-1cn 7972 | 
. . . . . . . . . . . . . 14
⊢ 1 ∈
ℂ | 
| 163 |   | npcan 8235 | 
. . . . . . . . . . . . . 14
⊢ ((𝑘 ∈ ℂ ∧ 1 ∈
ℂ) → ((𝑘 −
1) + 1) = 𝑘) | 
| 164 | 161, 162,
163 | sylancl 413 | 
. . . . . . . . . . . . 13
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → ((𝑘 − 1) + 1) = 𝑘) | 
| 165 | 164 | eleq1d 2265 | 
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → (((𝑘 − 1) + 1) ∈ ((0 + 1)...(𝑁 + 1)) ↔ 𝑘 ∈ ((0 + 1)...(𝑁 + 1)))) | 
| 166 | 160, 165 | bitrd 188 | 
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → ((𝑘 − 1) ∈ (0...𝑁) ↔ 𝑘 ∈ ((0 + 1)...(𝑁 + 1)))) | 
| 167 | 155, 166 | mtbird 674 | 
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → ¬ (𝑘 − 1) ∈ (0...𝑁)) | 
| 168 |   | bcval3 10843 | 
. . . . . . . . . 10
⊢ ((𝑁 ∈ ℕ0
∧ (𝑘 − 1) ∈
ℤ ∧ ¬ (𝑘
− 1) ∈ (0...𝑁))
→ (𝑁C(𝑘 − 1)) =
0) | 
| 169 | 149, 153,
167, 168 | syl3anc 1249 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → (𝑁C(𝑘 − 1)) = 0) | 
| 170 | 169 | oveq1d 5937 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = (0 · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 171 | 150, 62 | sylan2 286 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → (0 · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = 0) | 
| 172 | 170, 171 | eqtrd 2229 | 
. . . . . . 7
⊢ ((𝜑 ∧ 𝑘 ∈ ((0...(𝑁 + 1)) ∖ ((0 + 1)...(𝑁 + 1)))) → ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = 0) | 
| 173 | 67 | peano2zd 9451 | 
. . . . . . . . 9
⊢ ((𝜑 ∧ 𝑛 ∈ (ℤ≥‘0))
→ (0 + 1) ∈ ℤ) | 
| 174 |   | fzdcel 10115 | 
. . . . . . . . 9
⊢ ((𝑛 ∈ ℤ ∧ (0 + 1)
∈ ℤ ∧ (𝑁 +
1) ∈ ℤ) → DECID 𝑛 ∈ ((0 + 1)...(𝑁 + 1))) | 
| 175 | 66, 173, 74, 174 | syl3anc 1249 | 
. . . . . . . 8
⊢ ((𝜑 ∧ 𝑛 ∈ (ℤ≥‘0))
→ DECID 𝑛 ∈ ((0 + 1)...(𝑁 + 1))) | 
| 176 | 175 | ralrimiva 2570 | 
. . . . . . 7
⊢ (𝜑 → ∀𝑛 ∈
(ℤ≥‘0)DECID 𝑛 ∈ ((0 + 1)...(𝑁 + 1))) | 
| 177 | 146, 148,
172, 176, 4, 73, 77 | isumss 11556 | 
. . . . . 6
⊢ (𝜑 → Σ𝑘 ∈ ((0 + 1)...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 178 | 104, 145,
177 | 3eqtrd 2233 | 
. . . . 5
⊢ (𝜑 → Σ𝑘 ∈ (0...𝑁)(((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵) = Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 179 | 83, 178 | eqtrd 2229 | 
. . . 4
⊢ (𝜑 → (Σ𝑘 ∈ (0...𝑁)((𝑁C𝑘) · ((𝐴↑(𝑁 − 𝑘)) · (𝐵↑𝑘))) · 𝐵) = Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 180 | 82, 179 | sylan9eqr 2251 | 
. . 3
⊢ ((𝜑 ∧ 𝜓) → (((𝐴 + 𝐵)↑𝑁) · 𝐵) = Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 181 | 81, 180 | oveq12d 5940 | 
. 2
⊢ ((𝜑 ∧ 𝜓) → ((((𝐴 + 𝐵)↑𝑁) · 𝐴) + (((𝐴 + 𝐵)↑𝑁) · 𝐵)) = (Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) + Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))))) | 
| 182 | 8, 18 | addcld 8046 | 
. . . . 5
⊢ (𝜑 → (𝐴 + 𝐵) ∈ ℂ) | 
| 183 | 182, 5 | expp1d 10766 | 
. . . 4
⊢ (𝜑 → ((𝐴 + 𝐵)↑(𝑁 + 1)) = (((𝐴 + 𝐵)↑𝑁) · (𝐴 + 𝐵))) | 
| 184 | 182, 5 | expcld 10765 | 
. . . . 5
⊢ (𝜑 → ((𝐴 + 𝐵)↑𝑁) ∈ ℂ) | 
| 185 | 184, 8, 18 | adddid 8051 | 
. . . 4
⊢ (𝜑 → (((𝐴 + 𝐵)↑𝑁) · (𝐴 + 𝐵)) = ((((𝐴 + 𝐵)↑𝑁) · 𝐴) + (((𝐴 + 𝐵)↑𝑁) · 𝐵))) | 
| 186 | 183, 185 | eqtrd 2229 | 
. . 3
⊢ (𝜑 → ((𝐴 + 𝐵)↑(𝑁 + 1)) = ((((𝐴 + 𝐵)↑𝑁) · 𝐴) + (((𝐴 + 𝐵)↑𝑁) · 𝐵))) | 
| 187 | 186 | adantr 276 | 
. 2
⊢ ((𝜑 ∧ 𝜓) → ((𝐴 + 𝐵)↑(𝑁 + 1)) = ((((𝐴 + 𝐵)↑𝑁) · 𝐴) + (((𝐴 + 𝐵)↑𝑁) · 𝐵))) | 
| 188 |   | bcpasc 10858 | 
. . . . . . . 8
⊢ ((𝑁 ∈ ℕ0
∧ 𝑘 ∈ ℤ)
→ ((𝑁C𝑘) + (𝑁C(𝑘 − 1))) = ((𝑁 + 1)C𝑘)) | 
| 189 | 5, 10, 188 | syl2an 289 | 
. . . . . . 7
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → ((𝑁C𝑘) + (𝑁C(𝑘 − 1))) = ((𝑁 + 1)C𝑘)) | 
| 190 | 189 | oveq1d 5937 | 
. . . . . 6
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (((𝑁C𝑘) + (𝑁C(𝑘 − 1))) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = (((𝑁 + 1)C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) | 
| 191 | 13, 124, 50 | adddird 8052 | 
. . . . . 6
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (((𝑁C𝑘) + (𝑁C(𝑘 − 1))) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = (((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) + ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))))) | 
| 192 | 190, 191 | eqtr3d 2231 | 
. . . . 5
⊢ ((𝜑 ∧ 𝑘 ∈ (0...(𝑁 + 1))) → (((𝑁 + 1)C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = (((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) + ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))))) | 
| 193 | 192 | sumeq2dv 11533 | 
. . . 4
⊢ (𝜑 → Σ𝑘 ∈ (0...(𝑁 + 1))(((𝑁 + 1)C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = Σ𝑘 ∈ (0...(𝑁 + 1))(((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) + ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))))) | 
| 194 | 6 | peano2zd 9451 | 
. . . . . 6
⊢ (𝜑 → (𝑁 + 1) ∈ ℤ) | 
| 195 | 4, 194 | fzfigd 10523 | 
. . . . 5
⊢ (𝜑 → (0...(𝑁 + 1)) ∈ Fin) | 
| 196 | 195, 51, 147 | fsumadd 11571 | 
. . . 4
⊢ (𝜑 → Σ𝑘 ∈ (0...(𝑁 + 1))(((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) + ((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) = (Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) + Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))))) | 
| 197 | 193, 196 | eqtrd 2229 | 
. . 3
⊢ (𝜑 → Σ𝑘 ∈ (0...(𝑁 + 1))(((𝑁 + 1)C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = (Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) + Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))))) | 
| 198 | 197 | adantr 276 | 
. 2
⊢ ((𝜑 ∧ 𝜓) → Σ𝑘 ∈ (0...(𝑁 + 1))(((𝑁 + 1)C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) = (Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))) + Σ𝑘 ∈ (0...(𝑁 + 1))((𝑁C(𝑘 − 1)) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘))))) | 
| 199 | 181, 187,
198 | 3eqtr4d 2239 | 
1
⊢ ((𝜑 ∧ 𝜓) → ((𝐴 + 𝐵)↑(𝑁 + 1)) = Σ𝑘 ∈ (0...(𝑁 + 1))(((𝑁 + 1)C𝑘) · ((𝐴↑((𝑁 + 1) − 𝑘)) · (𝐵↑𝑘)))) |