Proof of Theorem rexuz3
Step | Hyp | Ref
| Expression |
1 | | ralel 3074 |
. . . 4
⊢
∀𝑘 ∈
𝑍 𝑘 ∈ 𝑍 |
2 | | fveq2 6756 |
. . . . . . 7
⊢ (𝑗 = 𝑀 → (ℤ≥‘𝑗) =
(ℤ≥‘𝑀)) |
3 | | rexuz3.1 |
. . . . . . 7
⊢ 𝑍 =
(ℤ≥‘𝑀) |
4 | 2, 3 | eqtr4di 2797 |
. . . . . 6
⊢ (𝑗 = 𝑀 → (ℤ≥‘𝑗) = 𝑍) |
5 | 4 | raleqdv 3339 |
. . . . 5
⊢ (𝑗 = 𝑀 → (∀𝑘 ∈ (ℤ≥‘𝑗)𝑘 ∈ 𝑍 ↔ ∀𝑘 ∈ 𝑍 𝑘 ∈ 𝑍)) |
6 | 5 | rspcev 3552 |
. . . 4
⊢ ((𝑀 ∈ ℤ ∧
∀𝑘 ∈ 𝑍 𝑘 ∈ 𝑍) → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝑘 ∈ 𝑍) |
7 | 1, 6 | mpan2 687 |
. . 3
⊢ (𝑀 ∈ ℤ →
∃𝑗 ∈ ℤ
∀𝑘 ∈
(ℤ≥‘𝑗)𝑘 ∈ 𝑍) |
8 | 7 | biantrurd 532 |
. 2
⊢ (𝑀 ∈ ℤ →
(∃𝑗 ∈ ℤ
∀𝑘 ∈
(ℤ≥‘𝑗)𝜑 ↔ (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝑘 ∈ 𝑍 ∧ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑))) |
9 | 3 | uztrn2 12530 |
. . . . . . . . . 10
⊢ ((𝑗 ∈ 𝑍 ∧ 𝑘 ∈ (ℤ≥‘𝑗)) → 𝑘 ∈ 𝑍) |
10 | 9 | a1d 25 |
. . . . . . . . 9
⊢ ((𝑗 ∈ 𝑍 ∧ 𝑘 ∈ (ℤ≥‘𝑗)) → (𝜑 → 𝑘 ∈ 𝑍)) |
11 | 10 | ancrd 551 |
. . . . . . . 8
⊢ ((𝑗 ∈ 𝑍 ∧ 𝑘 ∈ (ℤ≥‘𝑗)) → (𝜑 → (𝑘 ∈ 𝑍 ∧ 𝜑))) |
12 | 11 | ralimdva 3102 |
. . . . . . 7
⊢ (𝑗 ∈ 𝑍 → (∀𝑘 ∈ (ℤ≥‘𝑗)𝜑 → ∀𝑘 ∈ (ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑))) |
13 | | eluzelz 12521 |
. . . . . . . 8
⊢ (𝑗 ∈
(ℤ≥‘𝑀) → 𝑗 ∈ ℤ) |
14 | 13, 3 | eleq2s 2857 |
. . . . . . 7
⊢ (𝑗 ∈ 𝑍 → 𝑗 ∈ ℤ) |
15 | 12, 14 | jctild 525 |
. . . . . 6
⊢ (𝑗 ∈ 𝑍 → (∀𝑘 ∈ (ℤ≥‘𝑗)𝜑 → (𝑗 ∈ ℤ ∧ ∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑)))) |
16 | 15 | imp 406 |
. . . . 5
⊢ ((𝑗 ∈ 𝑍 ∧ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑) → (𝑗 ∈ ℤ ∧ ∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑))) |
17 | | uzid 12526 |
. . . . . . 7
⊢ (𝑗 ∈ ℤ → 𝑗 ∈
(ℤ≥‘𝑗)) |
18 | | simpl 482 |
. . . . . . . 8
⊢ ((𝑘 ∈ 𝑍 ∧ 𝜑) → 𝑘 ∈ 𝑍) |
19 | 18 | ralimi 3086 |
. . . . . . 7
⊢
(∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑) → ∀𝑘 ∈ (ℤ≥‘𝑗)𝑘 ∈ 𝑍) |
20 | | eleq1w 2821 |
. . . . . . . 8
⊢ (𝑘 = 𝑗 → (𝑘 ∈ 𝑍 ↔ 𝑗 ∈ 𝑍)) |
21 | 20 | rspcva 3550 |
. . . . . . 7
⊢ ((𝑗 ∈
(ℤ≥‘𝑗) ∧ ∀𝑘 ∈ (ℤ≥‘𝑗)𝑘 ∈ 𝑍) → 𝑗 ∈ 𝑍) |
22 | 17, 19, 21 | syl2an 595 |
. . . . . 6
⊢ ((𝑗 ∈ ℤ ∧
∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑)) → 𝑗 ∈ 𝑍) |
23 | | simpr 484 |
. . . . . . . 8
⊢ ((𝑘 ∈ 𝑍 ∧ 𝜑) → 𝜑) |
24 | 23 | ralimi 3086 |
. . . . . . 7
⊢
(∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑) → ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑) |
25 | 24 | adantl 481 |
. . . . . 6
⊢ ((𝑗 ∈ ℤ ∧
∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑)) → ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑) |
26 | 22, 25 | jca 511 |
. . . . 5
⊢ ((𝑗 ∈ ℤ ∧
∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑)) → (𝑗 ∈ 𝑍 ∧ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑)) |
27 | 16, 26 | impbii 208 |
. . . 4
⊢ ((𝑗 ∈ 𝑍 ∧ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑) ↔ (𝑗 ∈ ℤ ∧ ∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑))) |
28 | 27 | rexbii2 3175 |
. . 3
⊢
(∃𝑗 ∈
𝑍 ∀𝑘 ∈
(ℤ≥‘𝑗)𝜑 ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑)) |
29 | | rexanuz 14985 |
. . 3
⊢
(∃𝑗 ∈
ℤ ∀𝑘 ∈
(ℤ≥‘𝑗)(𝑘 ∈ 𝑍 ∧ 𝜑) ↔ (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝑘 ∈ 𝑍 ∧ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑)) |
30 | 28, 29 | bitr2i 275 |
. 2
⊢
((∃𝑗 ∈
ℤ ∀𝑘 ∈
(ℤ≥‘𝑗)𝑘 ∈ 𝑍 ∧ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑) ↔ ∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑) |
31 | 8, 30 | bitr2di 287 |
1
⊢ (𝑀 ∈ ℤ →
(∃𝑗 ∈ 𝑍 ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑 ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑)) |