Proof of Theorem recexpt
| Step | Hyp | Ref
| Expression |
| 1 | | opreq2 3975 |
. . . . . . 7
⊢ (j = 0 → ((1 / A)↑j) = ((1
/ A)↑0)) |
| 2 | | opreq2 3975 |
. . . . . . . 8
⊢ (j = 0 → (A↑j) =
(A↑0)) |
| 3 | 2 | opreq2d 3982 |
. . . . . . 7
⊢ (j = 0 → (1 / (A↑j)) = (1
/ (A↑0))) |
| 4 | 1, 3 | eqeq12d 1492 |
. . . . . 6
⊢ (j = 0 → (((1 / A)↑j) = (1
/ (A↑j)) ↔ ((1 / A)↑0) = (1 / (A↑0)))) |
| 5 | 4 | imbi2d 614 |
. . . . 5
⊢ (j = 0 → (((A ∈ ℂ ⋀ A ≠ 0) → ((1 / A)↑j) = (1
/ (A↑j))) ↔ ((A
∈ ℂ ⋀ A ≠ 0)
→ ((1 / A)↑0) = (1 / (A↑0))))) |
| 6 | | opreq2 3975 |
. . . . . . 7
⊢ (j = k → ((1
/ A)↑j) = ((1 / A)↑k)) |
| 7 | | opreq2 3975 |
. . . . . . . 8
⊢ (j = k →
(A↑j) = (A↑k)) |
| 8 | 7 | opreq2d 3982 |
. . . . . . 7
⊢ (j = k → (1
/ (A↑j)) = (1 / (A↑k))) |
| 9 | 6, 8 | eqeq12d 1492 |
. . . . . 6
⊢ (j = k →
(((1 / A)↑j) = (1 / (A↑j))
↔ ((1 / A)↑k) = (1 / (A↑k)))) |
| 10 | 9 | imbi2d 614 |
. . . . 5
⊢ (j = k →
(((A ∈
ℂ ⋀
A ≠ 0) → ((1 / A)↑j) = (1
/ (A↑j))) ↔ ((A
∈ ℂ ⋀ A ≠ 0)
→ ((1 / A)↑k) = (1 / (A↑k))))) |
| 11 | | opreq2 3975 |
. . . . . . 7
⊢ (j = (k + 1)
→ ((1 / A)↑j) = ((1 / A)↑(k +
1))) |
| 12 | | opreq2 3975 |
. . . . . . . 8
⊢ (j = (k + 1)
→ (A↑j) = (A↑(k +
1))) |
| 13 | 12 | opreq2d 3982 |
. . . . . . 7
⊢ (j = (k + 1)
→ (1 / (A↑j)) = (1 / (A↑(k +
1)))) |
| 14 | 11, 13 | eqeq12d 1492 |
. . . . . 6
⊢ (j = (k + 1)
→ (((1 / A)↑j) = (1 / (A↑j))
↔ ((1 / A)↑(k + 1)) = (1 / (A↑(k +
1))))) |
| 15 | 14 | imbi2d 614 |
. . . . 5
⊢ (j = (k + 1)
→ (((A ∈ ℂ ⋀ A ≠ 0)
→ ((1 / A)↑j) = (1 / (A↑j)))
↔ ((A ∈ ℂ ⋀ A ≠ 0)
→ ((1 / A)↑(k + 1)) = (1 / (A↑(k +
1)))))) |
| 16 | | opreq2 3975 |
. . . . . . 7
⊢ (j = N → ((1
/ A)↑j) = ((1 / A)↑N)) |
| 17 | | opreq2 3975 |
. . . . . . . 8
⊢ (j = N →
(A↑j) = (A↑N)) |
| 18 | 17 | opreq2d 3982 |
. . . . . . 7
⊢ (j = N → (1
/ (A↑j)) = (1 / (A↑N))) |
| 19 | 16, 18 | eqeq12d 1492 |
. . . . . 6
⊢ (j = N →
(((1 / A)↑j) = (1 / (A↑j))
↔ ((1 / A)↑N) = (1 / (A↑N)))) |
| 20 | 19 | imbi2d 614 |
. . . . 5
⊢ (j = N →
(((A ∈
ℂ ⋀
A ≠ 0) → ((1 / A)↑j) = (1
/ (A↑j))) ↔ ((A
∈ ℂ ⋀ A ≠ 0)
→ ((1 / A)↑N) = (1 / (A↑N))))) |
| 21 | | recclt 5727 |
. . . . . . 7
⊢ ((A ∈ ℂ ⋀ A ≠ 0) → (1 / A) ∈ ℂ) |
| 22 | | exp0t 6572 |
. . . . . . 7
⊢ ((1 / A) ∈ ℂ → ((1 / A)↑0) = 1) |
| 23 | 21, 22 | syl 10 |
. . . . . 6
⊢ ((A ∈ ℂ ⋀ A ≠ 0) → ((1 / A)↑0) = 1) |
| 24 | | exp0t 6572 |
. . . . . . . . 9
⊢ (A ∈ ℂ → (A↑0) = 1) |
| 25 | 24 | opreq2d 3982 |
. . . . . . . 8
⊢ (A ∈ ℂ → (1 / (A↑0)) = (1 / 1)) |
| 26 | | ax1cn 5281 |
. . . . . . . . 9
⊢ 1 ∈ ℂ |
| 27 | 26 | div1 5773 |
. . . . . . . 8
⊢ (1 / 1) = 1 |
| 28 | 25, 27 | syl6eq 1526 |
. . . . . . 7
⊢ (A ∈ ℂ → (1 / (A↑0)) = 1) |
| 29 | 28 | adantr 391 |
. . . . . 6
⊢ ((A ∈ ℂ ⋀ A ≠ 0) → (1 / (A↑0)) = 1) |
| 30 | 23, 29 | eqtr4d 1513 |
. . . . 5
⊢ ((A ∈ ℂ ⋀ A ≠ 0) → ((1 / A)↑0) = (1 / (A↑0))) |
| 31 | | opreq1 3974 |
. . . . . . . . . . 11
⊢ (((1 / A)↑k) = (1
/ (A↑k)) → (((1 / A)↑k)
· (1 / A)) = ((1 / (A↑k))
· (1 / A))) |
| 32 | 31 | ad2antll 409 |
. . . . . . . . . 10
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ (A ≠ 0
⋀ ((1 / A)↑k) = (1
/ (A↑k)))) → (((1 / A)↑k)
· (1 / A)) = ((1 / (A↑k))
· (1 / A))) |
| 33 | | expp1t 6575 |
. . . . . . . . . . . . 13
⊢ (((1 / A) ∈ ℂ ⋀ k ∈ ℕ0) → ((1 / A)↑(k + 1))
= (((1 / A)↑k) · (1 / A))) |
| 34 | 33, 21 | sylan 450 |
. . . . . . . . . . . 12
⊢ (((A ∈ ℂ ⋀ A ≠ 0) ⋀
k ∈ ℕ0) → ((1 / A)↑(k + 1))
= (((1 / A)↑k) · (1 / A))) |
| 35 | 34 | an1rs 491 |
. . . . . . . . . . 11
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ ((1 / A)↑(k + 1)) = (((1 / A)↑k)
· (1 / A))) |
| 36 | 35 | adantrr 397 |
. . . . . . . . . 10
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ (A ≠ 0
⋀ ((1 / A)↑k) = (1
/ (A↑k)))) → ((1 / A)↑(k + 1))
= (((1 / A)↑k) · (1 / A))) |
| 37 | | expp1t 6575 |
. . . . . . . . . . . . . 14
⊢ ((A ∈ ℂ ⋀ k ∈ ℕ0) → (A↑(k + 1))
= ((A↑k) · A)) |
| 38 | 37 | opreq2d 3982 |
. . . . . . . . . . . . 13
⊢ ((A ∈ ℂ ⋀ k ∈ ℕ0) → (1 / (A↑(k + 1)))
= (1 / ((A↑k) · A))) |
| 39 | 38 | adantr 391 |
. . . . . . . . . . . 12
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ (1 / (A↑(k + 1))) = (1 / ((A↑k)
· A))) |
| 40 | | divmuldivt 5782 |
. . . . . . . . . . . . . 14
⊢ ((((1 ∈ ℂ ⋀ (A↑k) ∈ ℂ) ⋀ (1 ∈ ℂ ⋀ A ∈ ℂ)) ⋀
((A↑k) ≠ 0 ⋀
A ≠ 0)) → ((1 / (A↑k))
· (1 / A)) = ((1 · 1) /
((A↑k) · A))) |
| 41 | | expclt 6582 |
. . . . . . . . . . . . . . . . 17
⊢ ((A ∈ ℂ ⋀ k ∈ ℕ0) → (A↑k) ∈ ℂ) |
| 42 | 41, 26 | jctil 292 |
. . . . . . . . . . . . . . . 16
⊢ ((A ∈ ℂ ⋀ k ∈ ℕ0) → (1 ∈ ℂ ⋀ (A↑k) ∈ ℂ)) |
| 43 | | pm3.26 319 |
. . . . . . . . . . . . . . . . 17
⊢ ((A ∈ ℂ ⋀ k ∈ ℕ0) → A ∈ ℂ) |
| 44 | 43, 26 | jctil 292 |
. . . . . . . . . . . . . . . 16
⊢ ((A ∈ ℂ ⋀ k ∈ ℕ0) → (1 ∈ ℂ ⋀ A ∈ ℂ)) |
| 45 | 42, 44 | jca 288 |
. . . . . . . . . . . . . . 15
⊢ ((A ∈ ℂ ⋀ k ∈ ℕ0) → ((1 ∈ ℂ ⋀ (A↑k) ∈ ℂ) ⋀ (1 ∈ ℂ ⋀ A ∈ ℂ))) |
| 46 | 45 | adantr 391 |
. . . . . . . . . . . . . 14
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ ((1 ∈ ℂ ⋀ (A↑k) ∈ ℂ) ⋀ (1 ∈ ℂ ⋀ A ∈ ℂ))) |
| 47 | | expne0it 6589 |
. . . . . . . . . . . . . . . 16
⊢ ((A ∈ ℂ ⋀ k ∈ ℕ0 ⋀
A ≠ 0) → (A↑k) ≠
0) |
| 48 | 47 | 3expa 835 |
. . . . . . . . . . . . . . 15
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ (A↑k) ≠ 0) |
| 49 | | pm3.27 323 |
. . . . . . . . . . . . . . 15
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ A ≠ 0) |
| 50 | 48, 49 | jca 288 |
. . . . . . . . . . . . . 14
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ ((A↑k) ≠ 0 ⋀
A ≠ 0)) |
| 51 | 40, 46, 50 | sylanc 473 |
. . . . . . . . . . . . 13
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ ((1 / (A↑k)) · (1 / A)) = ((1 · 1) / ((A↑k)
· A))) |
| 52 | 26 | mulid1 5344 |
. . . . . . . . . . . . . 14
⊢ (1 · 1) =
1 |
| 53 | 52 | opreq1i 3977 |
. . . . . . . . . . . . 13
⊢ ((1 · 1) /
((A↑k) · A))
= (1 / ((A↑k) · A)) |
| 54 | 51, 53 | syl6req 1527 |
. . . . . . . . . . . 12
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ (1 / ((A↑k) · A))
= ((1 / (A↑k)) · (1 / A))) |
| 55 | 39, 54 | eqtrd 1510 |
. . . . . . . . . . 11
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ A ≠ 0)
→ (1 / (A↑(k + 1))) = ((1 / (A↑k))
· (1 / A))) |
| 56 | 55 | adantrr 397 |
. . . . . . . . . 10
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ (A ≠ 0
⋀ ((1 / A)↑k) = (1
/ (A↑k)))) → (1 / (A↑(k + 1)))
= ((1 / (A↑k)) · (1 / A))) |
| 57 | 32, 36, 56 | 3eqtr4d 1520 |
. . . . . . . . 9
⊢ (((A ∈ ℂ ⋀ k ∈ ℕ0) ⋀ (A ≠ 0
⋀ ((1 / A)↑k) = (1
/ (A↑k)))) → ((1 / A)↑(k + 1))
= (1 / (A↑(k + 1)))) |
| 58 | 57 | exp43 386 |
. . . . . . . 8
⊢ (A ∈ ℂ → (k
∈ ℕ0 → (A ≠ 0 → (((1 / A)↑k) = (1
/ (A↑k)) → ((1 / A)↑(k + 1))
= (1 / (A↑(k + 1))))))) |
| 59 | 58 | com12 11 |
. . . . . . 7
⊢ (k ∈ ℕ0 → (A ∈ ℂ → (A
≠ 0 → (((1 / A)↑k) = (1 / (A↑k))
→ ((1 / A)↑(k + 1)) = (1 / (A↑(k +
1))))))) |
| 60 | 59 | imp3a 361 |
. . . . . 6
⊢ (k ∈ ℕ0 → ((A ∈ ℂ ⋀ A ≠ 0) → (((1 / A)↑k) = (1
/ (A↑k)) → ((1 / A)↑(k + 1))
= (1 / (A↑(k + 1)))))) |
| 61 | 60 | a2d 13 |
. . . . 5
⊢ (k ∈ ℕ0 → (((A ∈ ℂ ⋀ A ≠ 0) → ((1 / A)↑k) = (1
/ (A↑k))) → ((A
∈ ℂ ⋀ A ≠ 0)
→ ((1 / A)↑(k + 1)) = (1 / (A↑(k +
1)))))) |
| 62 | 5, 10, 15, 20, 30, 61 | nn0ind 6214 |
. . . 4
⊢ (N ∈ ℕ0 → ((A ∈ ℂ ⋀ A ≠ 0) → ((1 / A)↑N) = (1
/ (A↑N)))) |
| 63 | 62 | exp3a 376 |
. . 3
⊢ (N ∈ ℕ0 → (A ∈ ℂ → (A
≠ 0 → ((1 / A)↑N) = (1 / (A↑N))))) |
| 64 | 63 | com12 11 |
. 2
⊢ (A ∈ ℂ → (N
∈ ℕ0 → (A ≠ 0 → ((1 / A)↑N) = (1
/ (A↑N))))) |
| 65 | 64 | 3imp 829 |
1
⊢ ((A ∈ ℂ ⋀ N ∈ ℕ0 ⋀
A ≠ 0) → ((1 / A)↑N) = (1
/ (A↑N))) |