Step | Hyp | Ref
| Expression |
1 | | c0ex 10969 |
. . . 4
⊢ 0 ∈
V |
2 | | zindbi.4 |
. . . 4
⊢ (𝑥 = 0 → (𝜑 ↔ 𝜃)) |
3 | 1, 2 | sbcie 3759 |
. . 3
⊢
([0 / 𝑥]𝜑 ↔ 𝜃) |
4 | | 0z 12330 |
. . . . 5
⊢ 0 ∈
ℤ |
5 | | eleq1 2826 |
. . . . . . . . . 10
⊢ (𝑦 = 0 → (𝑦 ∈ ℤ ↔ 0 ∈
ℤ)) |
6 | | breq1 5077 |
. . . . . . . . . 10
⊢ (𝑦 = 0 → (𝑦 ≤ 𝑏 ↔ 0 ≤ 𝑏)) |
7 | 5, 6 | 3anbi13d 1437 |
. . . . . . . . 9
⊢ (𝑦 = 0 → ((𝑦 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝑦 ≤ 𝑏) ↔ (0 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 0 ≤
𝑏))) |
8 | | dfsbcq 3718 |
. . . . . . . . . 10
⊢ (𝑦 = 0 → ([𝑦 / 𝑥]𝜑 ↔ [0 / 𝑥]𝜑)) |
9 | 8 | bibi1d 344 |
. . . . . . . . 9
⊢ (𝑦 = 0 → (([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑) ↔ ([0 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑))) |
10 | 7, 9 | imbi12d 345 |
. . . . . . . 8
⊢ (𝑦 = 0 → (((𝑦 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝑦 ≤ 𝑏) → ([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)) ↔ ((0 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 0 ≤
𝑏) → ([0 /
𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)))) |
11 | | eleq1 2826 |
. . . . . . . . . 10
⊢ (𝑏 = 𝐴 → (𝑏 ∈ ℤ ↔ 𝐴 ∈ ℤ)) |
12 | | breq2 5078 |
. . . . . . . . . 10
⊢ (𝑏 = 𝐴 → (0 ≤ 𝑏 ↔ 0 ≤ 𝐴)) |
13 | 11, 12 | 3anbi23d 1438 |
. . . . . . . . 9
⊢ (𝑏 = 𝐴 → ((0 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 0 ≤
𝑏) ↔ (0 ∈ ℤ
∧ 𝐴 ∈ ℤ
∧ 0 ≤ 𝐴))) |
14 | | dfsbcq 3718 |
. . . . . . . . . 10
⊢ (𝑏 = 𝐴 → ([𝑏 / 𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑)) |
15 | 14 | bibi2d 343 |
. . . . . . . . 9
⊢ (𝑏 = 𝐴 → (([0 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑) ↔ ([0 / 𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑))) |
16 | 13, 15 | imbi12d 345 |
. . . . . . . 8
⊢ (𝑏 = 𝐴 → (((0 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 0 ≤
𝑏) → ([0 /
𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)) ↔ ((0 ∈ ℤ ∧ 𝐴 ∈ ℤ ∧ 0 ≤
𝐴) → ([0 /
𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑)))) |
17 | | dfsbcq 3718 |
. . . . . . . . . 10
⊢ (𝑎 = 𝑦 → ([𝑎 / 𝑥]𝜑 ↔ [𝑦 / 𝑥]𝜑)) |
18 | 17 | bibi2d 343 |
. . . . . . . . 9
⊢ (𝑎 = 𝑦 → (([𝑦 / 𝑥]𝜑 ↔ [𝑎 / 𝑥]𝜑) ↔ ([𝑦 / 𝑥]𝜑 ↔ [𝑦 / 𝑥]𝜑))) |
19 | | dfsbcq 3718 |
. . . . . . . . . 10
⊢ (𝑎 = 𝑏 → ([𝑎 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)) |
20 | 19 | bibi2d 343 |
. . . . . . . . 9
⊢ (𝑎 = 𝑏 → (([𝑦 / 𝑥]𝜑 ↔ [𝑎 / 𝑥]𝜑) ↔ ([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑))) |
21 | | dfsbcq 3718 |
. . . . . . . . . 10
⊢ (𝑎 = (𝑏 + 1) → ([𝑎 / 𝑥]𝜑 ↔ [(𝑏 + 1) / 𝑥]𝜑)) |
22 | 21 | bibi2d 343 |
. . . . . . . . 9
⊢ (𝑎 = (𝑏 + 1) → (([𝑦 / 𝑥]𝜑 ↔ [𝑎 / 𝑥]𝜑) ↔ ([𝑦 / 𝑥]𝜑 ↔ [(𝑏 + 1) / 𝑥]𝜑))) |
23 | | biidd 261 |
. . . . . . . . 9
⊢ (𝑦 ∈ ℤ →
([𝑦 / 𝑥]𝜑 ↔ [𝑦 / 𝑥]𝜑)) |
24 | | vex 3436 |
. . . . . . . . . . . . . . . 16
⊢ 𝑦 ∈ V |
25 | | zindbi.2 |
. . . . . . . . . . . . . . . 16
⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) |
26 | 24, 25 | sbcie 3759 |
. . . . . . . . . . . . . . 15
⊢
([𝑦 / 𝑥]𝜑 ↔ 𝜓) |
27 | | dfsbcq 3718 |
. . . . . . . . . . . . . . 15
⊢ (𝑦 = 𝑏 → ([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)) |
28 | 26, 27 | bitr3id 285 |
. . . . . . . . . . . . . 14
⊢ (𝑦 = 𝑏 → (𝜓 ↔ [𝑏 / 𝑥]𝜑)) |
29 | | ovex 7308 |
. . . . . . . . . . . . . . . 16
⊢ (𝑦 + 1) ∈ V |
30 | | zindbi.3 |
. . . . . . . . . . . . . . . 16
⊢ (𝑥 = (𝑦 + 1) → (𝜑 ↔ 𝜒)) |
31 | 29, 30 | sbcie 3759 |
. . . . . . . . . . . . . . 15
⊢
([(𝑦 + 1) /
𝑥]𝜑 ↔ 𝜒) |
32 | | oveq1 7282 |
. . . . . . . . . . . . . . . 16
⊢ (𝑦 = 𝑏 → (𝑦 + 1) = (𝑏 + 1)) |
33 | 32 | sbceq1d 3721 |
. . . . . . . . . . . . . . 15
⊢ (𝑦 = 𝑏 → ([(𝑦 + 1) / 𝑥]𝜑 ↔ [(𝑏 + 1) / 𝑥]𝜑)) |
34 | 31, 33 | bitr3id 285 |
. . . . . . . . . . . . . 14
⊢ (𝑦 = 𝑏 → (𝜒 ↔ [(𝑏 + 1) / 𝑥]𝜑)) |
35 | 28, 34 | bibi12d 346 |
. . . . . . . . . . . . 13
⊢ (𝑦 = 𝑏 → ((𝜓 ↔ 𝜒) ↔ ([𝑏 / 𝑥]𝜑 ↔ [(𝑏 + 1) / 𝑥]𝜑))) |
36 | | zindbi.1 |
. . . . . . . . . . . . 13
⊢ (𝑦 ∈ ℤ → (𝜓 ↔ 𝜒)) |
37 | 35, 36 | vtoclga 3513 |
. . . . . . . . . . . 12
⊢ (𝑏 ∈ ℤ →
([𝑏 / 𝑥]𝜑 ↔ [(𝑏 + 1) / 𝑥]𝜑)) |
38 | 37 | 3ad2ant2 1133 |
. . . . . . . . . . 11
⊢ ((𝑦 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝑦 ≤ 𝑏) → ([𝑏 / 𝑥]𝜑 ↔ [(𝑏 + 1) / 𝑥]𝜑)) |
39 | 38 | bibi2d 343 |
. . . . . . . . . 10
⊢ ((𝑦 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝑦 ≤ 𝑏) → (([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑) ↔ ([𝑦 / 𝑥]𝜑 ↔ [(𝑏 + 1) / 𝑥]𝜑))) |
40 | 39 | biimpd 228 |
. . . . . . . . 9
⊢ ((𝑦 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝑦 ≤ 𝑏) → (([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑) → ([𝑦 / 𝑥]𝜑 ↔ [(𝑏 + 1) / 𝑥]𝜑))) |
41 | 18, 20, 22, 20, 23, 40 | uzind 12412 |
. . . . . . . 8
⊢ ((𝑦 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝑦 ≤ 𝑏) → ([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)) |
42 | 10, 16, 41 | vtocl2g 3510 |
. . . . . . 7
⊢ ((0
∈ ℤ ∧ 𝐴
∈ ℤ) → ((0 ∈ ℤ ∧ 𝐴 ∈ ℤ ∧ 0 ≤ 𝐴) → ([0 / 𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑))) |
43 | 42 | 3adant3 1131 |
. . . . . 6
⊢ ((0
∈ ℤ ∧ 𝐴
∈ ℤ ∧ 0 ≤ 𝐴) → ((0 ∈ ℤ ∧ 𝐴 ∈ ℤ ∧ 0 ≤
𝐴) → ([0 /
𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑))) |
44 | 43 | pm2.43i 52 |
. . . . 5
⊢ ((0
∈ ℤ ∧ 𝐴
∈ ℤ ∧ 0 ≤ 𝐴) → ([0 / 𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑)) |
45 | 4, 44 | mp3an1 1447 |
. . . 4
⊢ ((𝐴 ∈ ℤ ∧ 0 ≤
𝐴) → ([0 /
𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑)) |
46 | | eleq1 2826 |
. . . . . . . . . . 11
⊢ (𝑦 = 𝐴 → (𝑦 ∈ ℤ ↔ 𝐴 ∈ ℤ)) |
47 | | breq1 5077 |
. . . . . . . . . . 11
⊢ (𝑦 = 𝐴 → (𝑦 ≤ 𝑏 ↔ 𝐴 ≤ 𝑏)) |
48 | 46, 47 | 3anbi13d 1437 |
. . . . . . . . . 10
⊢ (𝑦 = 𝐴 → ((𝑦 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝑦 ≤ 𝑏) ↔ (𝐴 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝐴 ≤ 𝑏))) |
49 | | dfsbcq 3718 |
. . . . . . . . . . 11
⊢ (𝑦 = 𝐴 → ([𝑦 / 𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑)) |
50 | 49 | bibi1d 344 |
. . . . . . . . . 10
⊢ (𝑦 = 𝐴 → (([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑) ↔ ([𝐴 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑))) |
51 | 48, 50 | imbi12d 345 |
. . . . . . . . 9
⊢ (𝑦 = 𝐴 → (((𝑦 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝑦 ≤ 𝑏) → ([𝑦 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)) ↔ ((𝐴 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝐴 ≤ 𝑏) → ([𝐴 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)))) |
52 | | eleq1 2826 |
. . . . . . . . . . 11
⊢ (𝑏 = 0 → (𝑏 ∈ ℤ ↔ 0 ∈
ℤ)) |
53 | | breq2 5078 |
. . . . . . . . . . 11
⊢ (𝑏 = 0 → (𝐴 ≤ 𝑏 ↔ 𝐴 ≤ 0)) |
54 | 52, 53 | 3anbi23d 1438 |
. . . . . . . . . 10
⊢ (𝑏 = 0 → ((𝐴 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝐴 ≤ 𝑏) ↔ (𝐴 ∈ ℤ ∧ 0 ∈ ℤ ∧
𝐴 ≤
0))) |
55 | | dfsbcq 3718 |
. . . . . . . . . . 11
⊢ (𝑏 = 0 → ([𝑏 / 𝑥]𝜑 ↔ [0 / 𝑥]𝜑)) |
56 | 55 | bibi2d 343 |
. . . . . . . . . 10
⊢ (𝑏 = 0 → (([𝐴 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑) ↔ ([𝐴 / 𝑥]𝜑 ↔ [0 / 𝑥]𝜑))) |
57 | 54, 56 | imbi12d 345 |
. . . . . . . . 9
⊢ (𝑏 = 0 → (((𝐴 ∈ ℤ ∧ 𝑏 ∈ ℤ ∧ 𝐴 ≤ 𝑏) → ([𝐴 / 𝑥]𝜑 ↔ [𝑏 / 𝑥]𝜑)) ↔ ((𝐴 ∈ ℤ ∧ 0 ∈ ℤ ∧
𝐴 ≤ 0) →
([𝐴 / 𝑥]𝜑 ↔ [0 / 𝑥]𝜑)))) |
58 | 51, 57, 41 | vtocl2g 3510 |
. . . . . . . 8
⊢ ((𝐴 ∈ ℤ ∧ 0 ∈
ℤ) → ((𝐴 ∈
ℤ ∧ 0 ∈ ℤ ∧ 𝐴 ≤ 0) → ([𝐴 / 𝑥]𝜑 ↔ [0 / 𝑥]𝜑))) |
59 | 58 | 3adant3 1131 |
. . . . . . 7
⊢ ((𝐴 ∈ ℤ ∧ 0 ∈
ℤ ∧ 𝐴 ≤ 0)
→ ((𝐴 ∈ ℤ
∧ 0 ∈ ℤ ∧ 𝐴 ≤ 0) → ([𝐴 / 𝑥]𝜑 ↔ [0 / 𝑥]𝜑))) |
60 | 59 | pm2.43i 52 |
. . . . . 6
⊢ ((𝐴 ∈ ℤ ∧ 0 ∈
ℤ ∧ 𝐴 ≤ 0)
→ ([𝐴 / 𝑥]𝜑 ↔ [0 / 𝑥]𝜑)) |
61 | 4, 60 | mp3an2 1448 |
. . . . 5
⊢ ((𝐴 ∈ ℤ ∧ 𝐴 ≤ 0) → ([𝐴 / 𝑥]𝜑 ↔ [0 / 𝑥]𝜑)) |
62 | 61 | bicomd 222 |
. . . 4
⊢ ((𝐴 ∈ ℤ ∧ 𝐴 ≤ 0) → ([0 /
𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑)) |
63 | | 0re 10977 |
. . . . 5
⊢ 0 ∈
ℝ |
64 | | zre 12323 |
. . . . 5
⊢ (𝐴 ∈ ℤ → 𝐴 ∈
ℝ) |
65 | | letric 11075 |
. . . . 5
⊢ ((0
∈ ℝ ∧ 𝐴
∈ ℝ) → (0 ≤ 𝐴 ∨ 𝐴 ≤ 0)) |
66 | 63, 64, 65 | sylancr 587 |
. . . 4
⊢ (𝐴 ∈ ℤ → (0 ≤
𝐴 ∨ 𝐴 ≤ 0)) |
67 | 45, 62, 66 | mpjaodan 956 |
. . 3
⊢ (𝐴 ∈ ℤ →
([0 / 𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑)) |
68 | 3, 67 | bitr3id 285 |
. 2
⊢ (𝐴 ∈ ℤ → (𝜃 ↔ [𝐴 / 𝑥]𝜑)) |
69 | | zindbi.5 |
. . 3
⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜏)) |
70 | 69 | sbcieg 3756 |
. 2
⊢ (𝐴 ∈ ℤ →
([𝐴 / 𝑥]𝜑 ↔ 𝜏)) |
71 | 68, 70 | bitrd 278 |
1
⊢ (𝐴 ∈ ℤ → (𝜃 ↔ 𝜏)) |