Proof of Theorem nndiv
| Step | Hyp | Ref
| Expression |
| 1 | | nnne0t 4444 |
. . 3
⊢ (A
∈ ℕ → A ≠ 0) |
| 2 | 1 | adantr 306 |
. 2
⊢ ((A
∈ ℕ ∧ B ∈ ℕ)
→ A ≠ 0) |
| 3 | | divcan3t 4251 |
. . . . . . . . . . . . . . 15
⊢ (((A
∈ ℂ ∧ x ∈ ℂ)
∧ A ≠ 0) → ((A · x) /
A) = x) |
| 4 | 3 | exp31 293 |
. . . . . . . . . . . . . 14
⊢ (A
∈ ℂ → (x ∈ ℂ
→ (A ≠ 0 → ((A · x) /
A) = x))) |
| 5 | | nncnt 4428 |
. . . . . . . . . . . . . 14
⊢ (x
∈ ℕ → x ∈
ℂ) |
| 6 | 4, 5 | syl5 22 |
. . . . . . . . . . . . 13
⊢ (A
∈ ℂ → (x ∈ ℕ
→ (A ≠ 0 → ((A · x) /
A) = x))) |
| 7 | 6 | com23 32 |
. . . . . . . . . . . 12
⊢ (A
∈ ℂ → (A ≠ 0 →
(x ∈ ℕ → ((A · x) /
A) = x))) |
| 8 | 7 | a1d 14 |
. . . . . . . . . . 11
⊢ (A
∈ ℂ → (B ∈ ℂ
→ (A ≠ 0 → (x ∈ ℕ → ((A · x) /
A) = x)))) |
| 9 | 8 | imp41 286 |
. . . . . . . . . 10
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) ∧ x ∈ ℕ) → ((A · x) /
A) = x) |
| 10 | 9 | cleqcomd 1106 |
. . . . . . . . 9
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) ∧ x ∈ ℕ) → x = ((A ·
x) / A)) |
| 11 | | opreq1 3006 |
. . . . . . . . 9
⊢ ((A
· x) = B → ((A
· x) / A) = (B /
A)) |
| 12 | 10, 11 | sylan9eq 1144 |
. . . . . . . 8
⊢ (((((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) ∧ x ∈ ℕ) ∧ (A · x) =
B) → x = (B /
A)) |
| 13 | | pm3.26 256 |
. . . . . . . . 9
⊢ (((((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) ∧ x ∈ ℕ) ∧ (A · x) =
B) → (((A ∈ ℂ ∧ B ∈ ℂ) ∧ A ≠ 0) ∧ x ∈ ℕ)) |
| 14 | 13 | pm3.27d 262 |
. . . . . . . 8
⊢ (((((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) ∧ x ∈ ℕ) ∧ (A · x) =
B) → x ∈ ℕ) |
| 15 | 12, 14 | eqeltrrd 1164 |
. . . . . . 7
⊢ (((((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) ∧ x ∈ ℕ) ∧ (A · x) =
B) → (B / A) ∈
ℕ) |
| 16 | 15 | exp31 293 |
. . . . . 6
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) → (x ∈ ℕ → ((A · x) =
B → (B / A) ∈
ℕ))) |
| 17 | 16 | r19.23adv 1286 |
. . . . 5
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) → (∃x ∈ ℕ (A · x) =
B → (B / A) ∈
ℕ)) |
| 18 | | opreq2 3007 |
. . . . . . . . . 10
⊢ (x =
(B / A)
→ (A · x) = (A ·
(B / A))) |
| 19 | 18 | cleq1d 1109 |
. . . . . . . . 9
⊢ (x =
(B / A)
→ ((A · x) = B ↔
(A · (B / A)) =
B)) |
| 20 | 19 | rcla4ev 1403 |
. . . . . . . 8
⊢ (((B /
A) ∈ ℕ ∧ (A · (B /
A)) = B) → ∃x ∈ ℕ (A · x) =
B) |
| 21 | | divcan2t 4229 |
. . . . . . . 8
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) → (A · (B /
A)) = B) |
| 22 | 20, 21 | sylan2 346 |
. . . . . . 7
⊢ (((B /
A) ∈ ℕ ∧ ((A ∈ ℂ ∧ B ∈ ℂ) ∧ A ≠ 0)) → ∃x ∈ ℕ (A · x) =
B) |
| 23 | 22 | exp 291 |
. . . . . 6
⊢ ((B /
A) ∈ ℕ → (((A ∈ ℂ ∧ B ∈ ℂ) ∧ A ≠ 0) → ∃x ∈ ℕ (A · x) =
B)) |
| 24 | 23 | com12 13 |
. . . . 5
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) → ((B / A) ∈
ℕ → ∃x ∈ ℕ
(A · x) = B)) |
| 25 | 17, 24 | impbid 397 |
. . . 4
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ A ≠ 0) → (∃x ∈ ℕ (A · x) =
B ↔ (B / A) ∈
ℕ)) |
| 26 | 25 | exp 291 |
. . 3
⊢ ((A
∈ ℂ ∧ B ∈ ℂ)
→ (A ≠ 0 → (∃x ∈ ℕ (A · x) =
B ↔ (B / A) ∈
ℕ))) |
| 27 | | nncnt 4428 |
. . 3
⊢ (A
∈ ℕ → A ∈
ℂ) |
| 28 | | nncnt 4428 |
. . 3
⊢ (B
∈ ℕ → B ∈
ℂ) |
| 29 | 26, 27, 28 | syl2an 349 |
. 2
⊢ ((A
∈ ℕ ∧ B ∈ ℕ)
→ (A ≠ 0 → (∃x ∈ ℕ (A · x) =
B ↔ (B / A) ∈
ℕ))) |
| 30 | 2, 29 | mpd 46 |
1
⊢ ((A
∈ ℕ ∧ B ∈ ℕ)
→ (∃x ∈ ℕ (A · x) =
B ↔ (B / A) ∈
ℕ)) |