Step | Hyp | Ref
| Expression |
1 | | recexap 8542 |
. . . 4
⊢ ((𝐵 ∈ ℂ ∧ 𝐵 # 0) → ∃𝑦 ∈ ℂ (𝐵 · 𝑦) = 1) |
2 | 1 | 3adant1 1004 |
. . 3
⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 # 0) → ∃𝑦 ∈ ℂ (𝐵 · 𝑦) = 1) |
3 | | simprl 521 |
. . . . . . 7
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → 𝑦 ∈ ℂ) |
4 | | simpll 519 |
. . . . . . 7
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → 𝐴 ∈ ℂ) |
5 | 3, 4 | mulcld 7911 |
. . . . . 6
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → (𝑦 · 𝐴) ∈ ℂ) |
6 | | oveq1 5844 |
. . . . . . . 8
⊢ ((𝐵 · 𝑦) = 1 → ((𝐵 · 𝑦) · 𝐴) = (1 · 𝐴)) |
7 | 6 | ad2antll 483 |
. . . . . . 7
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → ((𝐵 · 𝑦) · 𝐴) = (1 · 𝐴)) |
8 | | simplr 520 |
. . . . . . . 8
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → 𝐵 ∈ ℂ) |
9 | 8, 3, 4 | mulassd 7914 |
. . . . . . 7
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → ((𝐵 · 𝑦) · 𝐴) = (𝐵 · (𝑦 · 𝐴))) |
10 | 4 | mulid2d 7909 |
. . . . . . 7
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → (1 · 𝐴) = 𝐴) |
11 | 7, 9, 10 | 3eqtr3d 2205 |
. . . . . 6
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → (𝐵 · (𝑦 · 𝐴)) = 𝐴) |
12 | | oveq2 5845 |
. . . . . . . 8
⊢ (𝑥 = (𝑦 · 𝐴) → (𝐵 · 𝑥) = (𝐵 · (𝑦 · 𝐴))) |
13 | 12 | eqeq1d 2173 |
. . . . . . 7
⊢ (𝑥 = (𝑦 · 𝐴) → ((𝐵 · 𝑥) = 𝐴 ↔ (𝐵 · (𝑦 · 𝐴)) = 𝐴)) |
14 | 13 | rspcev 2826 |
. . . . . 6
⊢ (((𝑦 · 𝐴) ∈ ℂ ∧ (𝐵 · (𝑦 · 𝐴)) = 𝐴) → ∃𝑥 ∈ ℂ (𝐵 · 𝑥) = 𝐴) |
15 | 5, 11, 14 | syl2anc 409 |
. . . . 5
⊢ (((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) ∧ (𝑦 ∈ ℂ ∧ (𝐵 · 𝑦) = 1)) → ∃𝑥 ∈ ℂ (𝐵 · 𝑥) = 𝐴) |
16 | 15 | rexlimdvaa 2582 |
. . . 4
⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) →
(∃𝑦 ∈ ℂ
(𝐵 · 𝑦) = 1 → ∃𝑥 ∈ ℂ (𝐵 · 𝑥) = 𝐴)) |
17 | 16 | 3adant3 1006 |
. . 3
⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 # 0) → (∃𝑦 ∈ ℂ (𝐵 · 𝑦) = 1 → ∃𝑥 ∈ ℂ (𝐵 · 𝑥) = 𝐴)) |
18 | 2, 17 | mpd 13 |
. 2
⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 # 0) → ∃𝑥 ∈ ℂ (𝐵 · 𝑥) = 𝐴) |
19 | | eqtr3 2184 |
. . . . . . 7
⊢ (((𝐵 · 𝑥) = 𝐴 ∧ (𝐵 · 𝑦) = 𝐴) → (𝐵 · 𝑥) = (𝐵 · 𝑦)) |
20 | | mulcanap 8554 |
. . . . . . 7
⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ ∧ (𝐵 ∈ ℂ ∧ 𝐵 # 0)) → ((𝐵 · 𝑥) = (𝐵 · 𝑦) ↔ 𝑥 = 𝑦)) |
21 | 19, 20 | syl5ib 153 |
. . . . . 6
⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ ∧ (𝐵 ∈ ℂ ∧ 𝐵 # 0)) → (((𝐵 · 𝑥) = 𝐴 ∧ (𝐵 · 𝑦) = 𝐴) → 𝑥 = 𝑦)) |
22 | 21 | 3expa 1192 |
. . . . 5
⊢ (((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ (𝐵 ∈ ℂ ∧ 𝐵 # 0)) → (((𝐵 · 𝑥) = 𝐴 ∧ (𝐵 · 𝑦) = 𝐴) → 𝑥 = 𝑦)) |
23 | 22 | expcom 115 |
. . . 4
⊢ ((𝐵 ∈ ℂ ∧ 𝐵 # 0) → ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (((𝐵 · 𝑥) = 𝐴 ∧ (𝐵 · 𝑦) = 𝐴) → 𝑥 = 𝑦))) |
24 | 23 | 3adant1 1004 |
. . 3
⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 # 0) → ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (((𝐵 · 𝑥) = 𝐴 ∧ (𝐵 · 𝑦) = 𝐴) → 𝑥 = 𝑦))) |
25 | 24 | ralrimivv 2545 |
. 2
⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 # 0) → ∀𝑥 ∈ ℂ ∀𝑦 ∈ ℂ (((𝐵 · 𝑥) = 𝐴 ∧ (𝐵 · 𝑦) = 𝐴) → 𝑥 = 𝑦)) |
26 | | oveq2 5845 |
. . . 4
⊢ (𝑥 = 𝑦 → (𝐵 · 𝑥) = (𝐵 · 𝑦)) |
27 | 26 | eqeq1d 2173 |
. . 3
⊢ (𝑥 = 𝑦 → ((𝐵 · 𝑥) = 𝐴 ↔ (𝐵 · 𝑦) = 𝐴)) |
28 | 27 | reu4 2916 |
. 2
⊢
(∃!𝑥 ∈
ℂ (𝐵 · 𝑥) = 𝐴 ↔ (∃𝑥 ∈ ℂ (𝐵 · 𝑥) = 𝐴 ∧ ∀𝑥 ∈ ℂ ∀𝑦 ∈ ℂ (((𝐵 · 𝑥) = 𝐴 ∧ (𝐵 · 𝑦) = 𝐴) → 𝑥 = 𝑦))) |
29 | 18, 25, 28 | sylanbrc 414 |
1
⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐵 # 0) → ∃!𝑥 ∈ ℂ (𝐵 · 𝑥) = 𝐴) |