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Theorem dvexp 12854
 Description: Derivative of a power function. (Contributed by Mario Carneiro, 9-Aug-2014.) (Revised by Mario Carneiro, 10-Feb-2015.)
Assertion
Ref Expression
dvexp (𝑁 ∈ ℕ → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑁))) = (𝑥 ∈ ℂ ↦ (𝑁 · (𝑥↑(𝑁 − 1)))))
Distinct variable group:   𝑥,𝑁

Proof of Theorem dvexp
Dummy variables 𝑘 𝑛 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 oveq2 5782 . . . . 5 (𝑛 = 1 → (𝑥𝑛) = (𝑥↑1))
21mpteq2dv 4019 . . . 4 (𝑛 = 1 → (𝑥 ∈ ℂ ↦ (𝑥𝑛)) = (𝑥 ∈ ℂ ↦ (𝑥↑1)))
32oveq2d 5790 . . 3 (𝑛 = 1 → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑛))) = (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑1))))
4 id 19 . . . . 5 (𝑛 = 1 → 𝑛 = 1)
5 oveq1 5781 . . . . . 6 (𝑛 = 1 → (𝑛 − 1) = (1 − 1))
65oveq2d 5790 . . . . 5 (𝑛 = 1 → (𝑥↑(𝑛 − 1)) = (𝑥↑(1 − 1)))
74, 6oveq12d 5792 . . . 4 (𝑛 = 1 → (𝑛 · (𝑥↑(𝑛 − 1))) = (1 · (𝑥↑(1 − 1))))
87mpteq2dv 4019 . . 3 (𝑛 = 1 → (𝑥 ∈ ℂ ↦ (𝑛 · (𝑥↑(𝑛 − 1)))) = (𝑥 ∈ ℂ ↦ (1 · (𝑥↑(1 − 1)))))
93, 8eqeq12d 2154 . 2 (𝑛 = 1 → ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑛))) = (𝑥 ∈ ℂ ↦ (𝑛 · (𝑥↑(𝑛 − 1)))) ↔ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑1))) = (𝑥 ∈ ℂ ↦ (1 · (𝑥↑(1 − 1))))))
10 oveq2 5782 . . . . 5 (𝑛 = 𝑘 → (𝑥𝑛) = (𝑥𝑘))
1110mpteq2dv 4019 . . . 4 (𝑛 = 𝑘 → (𝑥 ∈ ℂ ↦ (𝑥𝑛)) = (𝑥 ∈ ℂ ↦ (𝑥𝑘)))
1211oveq2d 5790 . . 3 (𝑛 = 𝑘 → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑛))) = (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))))
13 id 19 . . . . 5 (𝑛 = 𝑘𝑛 = 𝑘)
14 oveq1 5781 . . . . . 6 (𝑛 = 𝑘 → (𝑛 − 1) = (𝑘 − 1))
1514oveq2d 5790 . . . . 5 (𝑛 = 𝑘 → (𝑥↑(𝑛 − 1)) = (𝑥↑(𝑘 − 1)))
1613, 15oveq12d 5792 . . . 4 (𝑛 = 𝑘 → (𝑛 · (𝑥↑(𝑛 − 1))) = (𝑘 · (𝑥↑(𝑘 − 1))))
1716mpteq2dv 4019 . . 3 (𝑛 = 𝑘 → (𝑥 ∈ ℂ ↦ (𝑛 · (𝑥↑(𝑛 − 1)))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))))
1812, 17eqeq12d 2154 . 2 (𝑛 = 𝑘 → ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑛))) = (𝑥 ∈ ℂ ↦ (𝑛 · (𝑥↑(𝑛 − 1)))) ↔ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))))
19 oveq2 5782 . . . . 5 (𝑛 = (𝑘 + 1) → (𝑥𝑛) = (𝑥↑(𝑘 + 1)))
2019mpteq2dv 4019 . . . 4 (𝑛 = (𝑘 + 1) → (𝑥 ∈ ℂ ↦ (𝑥𝑛)) = (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))))
2120oveq2d 5790 . . 3 (𝑛 = (𝑘 + 1) → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑛))) = (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1)))))
22 id 19 . . . . 5 (𝑛 = (𝑘 + 1) → 𝑛 = (𝑘 + 1))
23 oveq1 5781 . . . . . 6 (𝑛 = (𝑘 + 1) → (𝑛 − 1) = ((𝑘 + 1) − 1))
2423oveq2d 5790 . . . . 5 (𝑛 = (𝑘 + 1) → (𝑥↑(𝑛 − 1)) = (𝑥↑((𝑘 + 1) − 1)))
2522, 24oveq12d 5792 . . . 4 (𝑛 = (𝑘 + 1) → (𝑛 · (𝑥↑(𝑛 − 1))) = ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1))))
2625mpteq2dv 4019 . . 3 (𝑛 = (𝑘 + 1) → (𝑥 ∈ ℂ ↦ (𝑛 · (𝑥↑(𝑛 − 1)))) = (𝑥 ∈ ℂ ↦ ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1)))))
2721, 26eqeq12d 2154 . 2 (𝑛 = (𝑘 + 1) → ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑛))) = (𝑥 ∈ ℂ ↦ (𝑛 · (𝑥↑(𝑛 − 1)))) ↔ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1)))) = (𝑥 ∈ ℂ ↦ ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1))))))
28 oveq2 5782 . . . . 5 (𝑛 = 𝑁 → (𝑥𝑛) = (𝑥𝑁))
2928mpteq2dv 4019 . . . 4 (𝑛 = 𝑁 → (𝑥 ∈ ℂ ↦ (𝑥𝑛)) = (𝑥 ∈ ℂ ↦ (𝑥𝑁)))
3029oveq2d 5790 . . 3 (𝑛 = 𝑁 → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑛))) = (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑁))))
31 id 19 . . . . 5 (𝑛 = 𝑁𝑛 = 𝑁)
32 oveq1 5781 . . . . . 6 (𝑛 = 𝑁 → (𝑛 − 1) = (𝑁 − 1))
3332oveq2d 5790 . . . . 5 (𝑛 = 𝑁 → (𝑥↑(𝑛 − 1)) = (𝑥↑(𝑁 − 1)))
3431, 33oveq12d 5792 . . . 4 (𝑛 = 𝑁 → (𝑛 · (𝑥↑(𝑛 − 1))) = (𝑁 · (𝑥↑(𝑁 − 1))))
3534mpteq2dv 4019 . . 3 (𝑛 = 𝑁 → (𝑥 ∈ ℂ ↦ (𝑛 · (𝑥↑(𝑛 − 1)))) = (𝑥 ∈ ℂ ↦ (𝑁 · (𝑥↑(𝑁 − 1)))))
3630, 35eqeq12d 2154 . 2 (𝑛 = 𝑁 → ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑛))) = (𝑥 ∈ ℂ ↦ (𝑛 · (𝑥↑(𝑛 − 1)))) ↔ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑁))) = (𝑥 ∈ ℂ ↦ (𝑁 · (𝑥↑(𝑁 − 1))))))
37 exp1 10306 . . . . . 6 (𝑥 ∈ ℂ → (𝑥↑1) = 𝑥)
3837mpteq2ia 4014 . . . . 5 (𝑥 ∈ ℂ ↦ (𝑥↑1)) = (𝑥 ∈ ℂ ↦ 𝑥)
39 mptresid 4873 . . . . 5 (𝑥 ∈ ℂ ↦ 𝑥) = ( I ↾ ℂ)
4038, 39eqtri 2160 . . . 4 (𝑥 ∈ ℂ ↦ (𝑥↑1)) = ( I ↾ ℂ)
4140oveq2i 5785 . . 3 (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑1))) = (ℂ D ( I ↾ ℂ))
42 1m1e0 8796 . . . . . . . . . 10 (1 − 1) = 0
4342oveq2i 5785 . . . . . . . . 9 (𝑥↑(1 − 1)) = (𝑥↑0)
44 exp0 10304 . . . . . . . . 9 (𝑥 ∈ ℂ → (𝑥↑0) = 1)
4543, 44syl5eq 2184 . . . . . . . 8 (𝑥 ∈ ℂ → (𝑥↑(1 − 1)) = 1)
4645oveq2d 5790 . . . . . . 7 (𝑥 ∈ ℂ → (1 · (𝑥↑(1 − 1))) = (1 · 1))
47 1t1e1 8879 . . . . . . 7 (1 · 1) = 1
4846, 47syl6eq 2188 . . . . . 6 (𝑥 ∈ ℂ → (1 · (𝑥↑(1 − 1))) = 1)
4948mpteq2ia 4014 . . . . 5 (𝑥 ∈ ℂ ↦ (1 · (𝑥↑(1 − 1)))) = (𝑥 ∈ ℂ ↦ 1)
50 fconstmpt 4586 . . . . 5 (ℂ × {1}) = (𝑥 ∈ ℂ ↦ 1)
5149, 50eqtr4i 2163 . . . 4 (𝑥 ∈ ℂ ↦ (1 · (𝑥↑(1 − 1)))) = (ℂ × {1})
52 dvid 12841 . . . 4 (ℂ D ( I ↾ ℂ)) = (ℂ × {1})
5351, 52eqtr4i 2163 . . 3 (𝑥 ∈ ℂ ↦ (1 · (𝑥↑(1 − 1)))) = (ℂ D ( I ↾ ℂ))
5441, 53eqtr4i 2163 . 2 (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑1))) = (𝑥 ∈ ℂ ↦ (1 · (𝑥↑(1 − 1))))
55 nncn 8735 . . . . . . . . . . . 12 (𝑘 ∈ ℕ → 𝑘 ∈ ℂ)
5655adantr 274 . . . . . . . . . . 11 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → 𝑘 ∈ ℂ)
57 ax-1cn 7720 . . . . . . . . . . 11 1 ∈ ℂ
58 pncan 7975 . . . . . . . . . . 11 ((𝑘 ∈ ℂ ∧ 1 ∈ ℂ) → ((𝑘 + 1) − 1) = 𝑘)
5956, 57, 58sylancl 409 . . . . . . . . . 10 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → ((𝑘 + 1) − 1) = 𝑘)
6059oveq2d 5790 . . . . . . . . 9 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (𝑥↑((𝑘 + 1) − 1)) = (𝑥𝑘))
6160oveq2d 5790 . . . . . . . 8 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1))) = ((𝑘 + 1) · (𝑥𝑘)))
6257a1i 9 . . . . . . . . 9 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → 1 ∈ ℂ)
63 id 19 . . . . . . . . . 10 (𝑥 ∈ ℂ → 𝑥 ∈ ℂ)
64 nnnn0 8991 . . . . . . . . . 10 (𝑘 ∈ ℕ → 𝑘 ∈ ℕ0)
65 expcl 10318 . . . . . . . . . 10 ((𝑥 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝑥𝑘) ∈ ℂ)
6663, 64, 65syl2anr 288 . . . . . . . . 9 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (𝑥𝑘) ∈ ℂ)
6756, 62, 66adddird 7798 . . . . . . . 8 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → ((𝑘 + 1) · (𝑥𝑘)) = ((𝑘 · (𝑥𝑘)) + (1 · (𝑥𝑘))))
6866mulid2d 7791 . . . . . . . . 9 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (1 · (𝑥𝑘)) = (𝑥𝑘))
6968oveq2d 5790 . . . . . . . 8 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → ((𝑘 · (𝑥𝑘)) + (1 · (𝑥𝑘))) = ((𝑘 · (𝑥𝑘)) + (𝑥𝑘)))
7061, 67, 693eqtrd 2176 . . . . . . 7 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1))) = ((𝑘 · (𝑥𝑘)) + (𝑥𝑘)))
7170mpteq2dva 4018 . . . . . 6 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1)))) = (𝑥 ∈ ℂ ↦ ((𝑘 · (𝑥𝑘)) + (𝑥𝑘))))
72 cnex 7751 . . . . . . . 8 ℂ ∈ V
7372a1i 9 . . . . . . 7 (𝑘 ∈ ℕ → ℂ ∈ V)
7456, 66mulcld 7793 . . . . . . 7 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (𝑘 · (𝑥𝑘)) ∈ ℂ)
75 nnm1nn0 9025 . . . . . . . . . . 11 (𝑘 ∈ ℕ → (𝑘 − 1) ∈ ℕ0)
76 expcl 10318 . . . . . . . . . . 11 ((𝑥 ∈ ℂ ∧ (𝑘 − 1) ∈ ℕ0) → (𝑥↑(𝑘 − 1)) ∈ ℂ)
7763, 75, 76syl2anr 288 . . . . . . . . . 10 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (𝑥↑(𝑘 − 1)) ∈ ℂ)
7856, 77mulcld 7793 . . . . . . . . 9 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (𝑘 · (𝑥↑(𝑘 − 1))) ∈ ℂ)
79 simpr 109 . . . . . . . . 9 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → 𝑥 ∈ ℂ)
80 eqidd 2140 . . . . . . . . 9 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))))
8139eqcomi 2143 . . . . . . . . . 10 ( I ↾ ℂ) = (𝑥 ∈ ℂ ↦ 𝑥)
8281a1i 9 . . . . . . . . 9 (𝑘 ∈ ℕ → ( I ↾ ℂ) = (𝑥 ∈ ℂ ↦ 𝑥))
8373, 78, 79, 80, 82offval2 5997 . . . . . . . 8 (𝑘 ∈ ℕ → ((𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) ∘𝑓 · ( I ↾ ℂ)) = (𝑥 ∈ ℂ ↦ ((𝑘 · (𝑥↑(𝑘 − 1))) · 𝑥)))
8456, 77, 79mulassd 7796 . . . . . . . . . 10 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → ((𝑘 · (𝑥↑(𝑘 − 1))) · 𝑥) = (𝑘 · ((𝑥↑(𝑘 − 1)) · 𝑥)))
85 expm1t 10328 . . . . . . . . . . . 12 ((𝑥 ∈ ℂ ∧ 𝑘 ∈ ℕ) → (𝑥𝑘) = ((𝑥↑(𝑘 − 1)) · 𝑥))
8685ancoms 266 . . . . . . . . . . 11 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (𝑥𝑘) = ((𝑥↑(𝑘 − 1)) · 𝑥))
8786oveq2d 5790 . . . . . . . . . 10 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (𝑘 · (𝑥𝑘)) = (𝑘 · ((𝑥↑(𝑘 − 1)) · 𝑥)))
8884, 87eqtr4d 2175 . . . . . . . . 9 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → ((𝑘 · (𝑥↑(𝑘 − 1))) · 𝑥) = (𝑘 · (𝑥𝑘)))
8988mpteq2dva 4018 . . . . . . . 8 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ ((𝑘 · (𝑥↑(𝑘 − 1))) · 𝑥)) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥𝑘))))
9083, 89eqtrd 2172 . . . . . . 7 (𝑘 ∈ ℕ → ((𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) ∘𝑓 · ( I ↾ ℂ)) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥𝑘))))
9152, 50eqtri 2160 . . . . . . . . . 10 (ℂ D ( I ↾ ℂ)) = (𝑥 ∈ ℂ ↦ 1)
9291a1i 9 . . . . . . . . 9 (𝑘 ∈ ℕ → (ℂ D ( I ↾ ℂ)) = (𝑥 ∈ ℂ ↦ 1))
93 eqidd 2140 . . . . . . . . 9 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ (𝑥𝑘)) = (𝑥 ∈ ℂ ↦ (𝑥𝑘)))
9473, 62, 66, 92, 93offval2 5997 . . . . . . . 8 (𝑘 ∈ ℕ → ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (1 · (𝑥𝑘))))
9568mpteq2dva 4018 . . . . . . . 8 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ (1 · (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑥𝑘)))
9694, 95eqtrd 2172 . . . . . . 7 (𝑘 ∈ ℕ → ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑥𝑘)))
9773, 74, 66, 90, 96offval2 5997 . . . . . 6 (𝑘 ∈ ℕ → (((𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) ∘𝑓 · ( I ↾ ℂ)) ∘𝑓 + ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘)))) = (𝑥 ∈ ℂ ↦ ((𝑘 · (𝑥𝑘)) + (𝑥𝑘))))
9871, 97eqtr4d 2175 . . . . 5 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1)))) = (((𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) ∘𝑓 · ( I ↾ ℂ)) ∘𝑓 + ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘)))))
99 oveq1 5781 . . . . . . 7 ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) → ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) ∘𝑓 · ( I ↾ ℂ)) = ((𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) ∘𝑓 · ( I ↾ ℂ)))
10099oveq1d 5789 . . . . . 6 ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) → (((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) ∘𝑓 · ( I ↾ ℂ)) ∘𝑓 + ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘)))) = (((𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) ∘𝑓 · ( I ↾ ℂ)) ∘𝑓 + ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘)))))
101100eqcomd 2145 . . . . 5 ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) → (((𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) ∘𝑓 · ( I ↾ ℂ)) ∘𝑓 + ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘)))) = (((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) ∘𝑓 · ( I ↾ ℂ)) ∘𝑓 + ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘)))))
10298, 101sylan9eq 2192 . . . 4 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → (𝑥 ∈ ℂ ↦ ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1)))) = (((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) ∘𝑓 · ( I ↾ ℂ)) ∘𝑓 + ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘)))))
103 cnelprrecn 7763 . . . . . 6 ℂ ∈ {ℝ, ℂ}
104103a1i 9 . . . . 5 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → ℂ ∈ {ℝ, ℂ})
105 ssidd 3118 . . . . 5 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → ℂ ⊆ ℂ)
10666fmpttd 5575 . . . . . 6 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ (𝑥𝑘)):ℂ⟶ℂ)
107106adantr 274 . . . . 5 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → (𝑥 ∈ ℂ ↦ (𝑥𝑘)):ℂ⟶ℂ)
108 f1oi 5405 . . . . . 6 ( I ↾ ℂ):ℂ–1-1-onto→ℂ
109 f1of 5367 . . . . . 6 (( I ↾ ℂ):ℂ–1-1-onto→ℂ → ( I ↾ ℂ):ℂ⟶ℂ)
110108, 109mp1i 10 . . . . 5 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → ( I ↾ ℂ):ℂ⟶ℂ)
111 simpr 109 . . . . . . 7 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))))
112111dmeqd 4741 . . . . . 6 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → dom (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = dom (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))))
11378fmpttd 5575 . . . . . . . 8 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))):ℂ⟶ℂ)
114113adantr 274 . . . . . . 7 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))):ℂ⟶ℂ)
115114fdmd 5279 . . . . . 6 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → dom (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) = ℂ)
116112, 115eqtrd 2172 . . . . 5 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → dom (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = ℂ)
117 1ex 7768 . . . . . . . . 9 1 ∈ V
118117fconst 5318 . . . . . . . 8 (ℂ × {1}):ℂ⟶{1}
11952feq1i 5265 . . . . . . . 8 ((ℂ D ( I ↾ ℂ)):ℂ⟶{1} ↔ (ℂ × {1}):ℂ⟶{1})
120118, 119mpbir 145 . . . . . . 7 (ℂ D ( I ↾ ℂ)):ℂ⟶{1}
121120fdmi 5280 . . . . . 6 dom (ℂ D ( I ↾ ℂ)) = ℂ
122121a1i 9 . . . . 5 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → dom (ℂ D ( I ↾ ℂ)) = ℂ)
123104, 105, 107, 110, 116, 122dvimulf 12849 . . . 4 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → (ℂ D ((𝑥 ∈ ℂ ↦ (𝑥𝑘)) ∘𝑓 · ( I ↾ ℂ))) = (((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) ∘𝑓 · ( I ↾ ℂ)) ∘𝑓 + ((ℂ D ( I ↾ ℂ)) ∘𝑓 · (𝑥 ∈ ℂ ↦ (𝑥𝑘)))))
12473, 66, 79, 93, 82offval2 5997 . . . . . . 7 (𝑘 ∈ ℕ → ((𝑥 ∈ ℂ ↦ (𝑥𝑘)) ∘𝑓 · ( I ↾ ℂ)) = (𝑥 ∈ ℂ ↦ ((𝑥𝑘) · 𝑥)))
125 expp1 10307 . . . . . . . . 9 ((𝑥 ∈ ℂ ∧ 𝑘 ∈ ℕ0) → (𝑥↑(𝑘 + 1)) = ((𝑥𝑘) · 𝑥))
12663, 64, 125syl2anr 288 . . . . . . . 8 ((𝑘 ∈ ℕ ∧ 𝑥 ∈ ℂ) → (𝑥↑(𝑘 + 1)) = ((𝑥𝑘) · 𝑥))
127126mpteq2dva 4018 . . . . . . 7 (𝑘 ∈ ℕ → (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))) = (𝑥 ∈ ℂ ↦ ((𝑥𝑘) · 𝑥)))
128124, 127eqtr4d 2175 . . . . . 6 (𝑘 ∈ ℕ → ((𝑥 ∈ ℂ ↦ (𝑥𝑘)) ∘𝑓 · ( I ↾ ℂ)) = (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1))))
129128oveq2d 5790 . . . . 5 (𝑘 ∈ ℕ → (ℂ D ((𝑥 ∈ ℂ ↦ (𝑥𝑘)) ∘𝑓 · ( I ↾ ℂ))) = (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1)))))
130129adantr 274 . . . 4 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → (ℂ D ((𝑥 ∈ ℂ ↦ (𝑥𝑘)) ∘𝑓 · ( I ↾ ℂ))) = (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1)))))
131102, 123, 1303eqtr2rd 2179 . . 3 ((𝑘 ∈ ℕ ∧ (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1))))) → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1)))) = (𝑥 ∈ ℂ ↦ ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1)))))
132131ex 114 . 2 (𝑘 ∈ ℕ → ((ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑘))) = (𝑥 ∈ ℂ ↦ (𝑘 · (𝑥↑(𝑘 − 1)))) → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥↑(𝑘 + 1)))) = (𝑥 ∈ ℂ ↦ ((𝑘 + 1) · (𝑥↑((𝑘 + 1) − 1))))))
1339, 18, 27, 36, 54, 132nnind 8743 1 (𝑁 ∈ ℕ → (ℂ D (𝑥 ∈ ℂ ↦ (𝑥𝑁))) = (𝑥 ∈ ℂ ↦ (𝑁 · (𝑥↑(𝑁 − 1)))))
 Colors of variables: wff set class Syntax hints:   → wi 4   ∧ wa 103   = wceq 1331   ∈ wcel 1480  Vcvv 2686  {csn 3527  {cpr 3528   ↦ cmpt 3989   I cid 4210   × cxp 4537  dom cdm 4539   ↾ cres 4541  ⟶wf 5119  –1-1-onto→wf1o 5122  (class class class)co 5774   ∘𝑓 cof 5980  ℂcc 7625  ℝcr 7626  0cc0 7627  1c1 7628   + caddc 7630   · cmul 7632   − cmin 7940  ℕcn 8727  ℕ0cn0 8984  ↑cexp 10299   D cdv 12803 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-coll 4043  ax-sep 4046  ax-nul 4054  ax-pow 4098  ax-pr 4131  ax-un 4355  ax-setind 4452  ax-iinf 4502  ax-cnex 7718  ax-resscn 7719  ax-1cn 7720  ax-1re 7721  ax-icn 7722  ax-addcl 7723  ax-addrcl 7724  ax-mulcl 7725  ax-mulrcl 7726  ax-addcom 7727  ax-mulcom 7728  ax-addass 7729  ax-mulass 7730  ax-distr 7731  ax-i2m1 7732  ax-0lt1 7733  ax-1rid 7734  ax-0id 7735  ax-rnegex 7736  ax-precex 7737  ax-cnre 7738  ax-pre-ltirr 7739  ax-pre-ltwlin 7740  ax-pre-lttrn 7741  ax-pre-apti 7742  ax-pre-ltadd 7743  ax-pre-mulgt0 7744  ax-pre-mulext 7745  ax-arch 7746  ax-caucvg 7747  ax-addf 7749  ax-mulf 7750 This theorem depends on definitions:  df-bi 116  df-stab 816  df-dc 820  df-3or 963  df-3an 964  df-tru 1334  df-fal 1337  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ne 2309  df-nel 2404  df-ral 2421  df-rex 2422  df-reu 2423  df-rmo 2424  df-rab 2425  df-v 2688  df-sbc 2910  df-csb 3004  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-nul 3364  df-if 3475  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-int 3772  df-iun 3815  df-br 3930  df-opab 3990  df-mpt 3991  df-tr 4027  df-id 4215  df-po 4218  df-iso 4219  df-iord 4288  df-on 4290  df-ilim 4291  df-suc 4293  df-iom 4505  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-rn 4550  df-res 4551  df-ima 4552  df-iota 5088  df-fun 5125  df-fn 5126  df-f 5127  df-f1 5128  df-fo 5129  df-f1o 5130  df-fv 5131  df-isom 5132  df-riota 5730  df-ov 5777  df-oprab 5778  df-mpo 5779  df-of 5982  df-1st 6038  df-2nd 6039  df-recs 6202  df-frec 6288  df-map 6544  df-pm 6545  df-sup 6871  df-inf 6872  df-pnf 7809  df-mnf 7810  df-xr 7811  df-ltxr 7812  df-le 7813  df-sub 7942  df-neg 7943  df-reap 8344  df-ap 8351  df-div 8440  df-inn 8728  df-2 8786  df-3 8787  df-4 8788  df-n0 8985  df-z 9062  df-uz 9334  df-q 9419  df-rp 9449  df-xneg 9566  df-xadd 9567  df-seqfrec 10226  df-exp 10300  df-cj 10621  df-re 10622  df-im 10623  df-rsqrt 10777  df-abs 10778  df-rest 12132  df-topgen 12151  df-psmet 12166  df-xmet 12167  df-met 12168  df-bl 12169  df-mopn 12170  df-top 12175  df-topon 12188  df-bases 12220  df-ntr 12275  df-cn 12367  df-cnp 12368  df-tx 12432  df-cncf 12737  df-limced 12804  df-dvap 12805 This theorem is referenced by:  dvexp2  12855
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