Step | Hyp | Ref
| Expression |
1 | | r19.26 2592 |
. . . 4
⊢
(∀𝑘 ∈
(ℤ≥‘𝑗)(𝜑 ∧ 𝜓) ↔ (∀𝑘 ∈ (ℤ≥‘𝑗)𝜑 ∧ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓)) |
2 | 1 | rexbii 2473 |
. . 3
⊢
(∃𝑗 ∈
ℤ ∀𝑘 ∈
(ℤ≥‘𝑗)(𝜑 ∧ 𝜓) ↔ ∃𝑗 ∈ ℤ (∀𝑘 ∈ (ℤ≥‘𝑗)𝜑 ∧ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓)) |
3 | | r19.40 2620 |
. . 3
⊢
(∃𝑗 ∈
ℤ (∀𝑘 ∈
(ℤ≥‘𝑗)𝜑 ∧ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓) → (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑 ∧ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓)) |
4 | 2, 3 | sylbi 120 |
. 2
⊢
(∃𝑗 ∈
ℤ ∀𝑘 ∈
(ℤ≥‘𝑗)(𝜑 ∧ 𝜓) → (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑 ∧ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓)) |
5 | | uzf 9469 |
. . . 4
⊢
ℤ≥:ℤ⟶𝒫 ℤ |
6 | | ffn 5337 |
. . . 4
⊢
(ℤ≥:ℤ⟶𝒫 ℤ →
ℤ≥ Fn ℤ) |
7 | | raleq 2661 |
. . . . 5
⊢ (𝑥 =
(ℤ≥‘𝑗) → (∀𝑘 ∈ 𝑥 𝜑 ↔ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑)) |
8 | 7 | rexrn 5622 |
. . . 4
⊢
(ℤ≥ Fn ℤ → (∃𝑥 ∈ ran
ℤ≥∀𝑘 ∈ 𝑥 𝜑 ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑)) |
9 | 5, 6, 8 | mp2b 8 |
. . 3
⊢
(∃𝑥 ∈ ran
ℤ≥∀𝑘 ∈ 𝑥 𝜑 ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑) |
10 | | raleq 2661 |
. . . . 5
⊢ (𝑦 =
(ℤ≥‘𝑗) → (∀𝑘 ∈ 𝑦 𝜓 ↔ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓)) |
11 | 10 | rexrn 5622 |
. . . 4
⊢
(ℤ≥ Fn ℤ → (∃𝑦 ∈ ran
ℤ≥∀𝑘 ∈ 𝑦 𝜓 ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓)) |
12 | 5, 6, 11 | mp2b 8 |
. . 3
⊢
(∃𝑦 ∈ ran
ℤ≥∀𝑘 ∈ 𝑦 𝜓 ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓) |
13 | | uzin2 10929 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ran
ℤ≥ ∧ 𝑦 ∈ ran ℤ≥) →
(𝑥 ∩ 𝑦) ∈ ran
ℤ≥) |
14 | | inss1 3342 |
. . . . . . . . . . . 12
⊢ (𝑥 ∩ 𝑦) ⊆ 𝑥 |
15 | | ssralv 3206 |
. . . . . . . . . . . 12
⊢ ((𝑥 ∩ 𝑦) ⊆ 𝑥 → (∀𝑘 ∈ 𝑥 𝜑 → ∀𝑘 ∈ (𝑥 ∩ 𝑦)𝜑)) |
16 | 14, 15 | ax-mp 5 |
. . . . . . . . . . 11
⊢
(∀𝑘 ∈
𝑥 𝜑 → ∀𝑘 ∈ (𝑥 ∩ 𝑦)𝜑) |
17 | | inss2 3343 |
. . . . . . . . . . . 12
⊢ (𝑥 ∩ 𝑦) ⊆ 𝑦 |
18 | | ssralv 3206 |
. . . . . . . . . . . 12
⊢ ((𝑥 ∩ 𝑦) ⊆ 𝑦 → (∀𝑘 ∈ 𝑦 𝜓 → ∀𝑘 ∈ (𝑥 ∩ 𝑦)𝜓)) |
19 | 17, 18 | ax-mp 5 |
. . . . . . . . . . 11
⊢
(∀𝑘 ∈
𝑦 𝜓 → ∀𝑘 ∈ (𝑥 ∩ 𝑦)𝜓) |
20 | 16, 19 | anim12i 336 |
. . . . . . . . . 10
⊢
((∀𝑘 ∈
𝑥 𝜑 ∧ ∀𝑘 ∈ 𝑦 𝜓) → (∀𝑘 ∈ (𝑥 ∩ 𝑦)𝜑 ∧ ∀𝑘 ∈ (𝑥 ∩ 𝑦)𝜓)) |
21 | | r19.26 2592 |
. . . . . . . . . 10
⊢
(∀𝑘 ∈
(𝑥 ∩ 𝑦)(𝜑 ∧ 𝜓) ↔ (∀𝑘 ∈ (𝑥 ∩ 𝑦)𝜑 ∧ ∀𝑘 ∈ (𝑥 ∩ 𝑦)𝜓)) |
22 | 20, 21 | sylibr 133 |
. . . . . . . . 9
⊢
((∀𝑘 ∈
𝑥 𝜑 ∧ ∀𝑘 ∈ 𝑦 𝜓) → ∀𝑘 ∈ (𝑥 ∩ 𝑦)(𝜑 ∧ 𝜓)) |
23 | | raleq 2661 |
. . . . . . . . . 10
⊢ (𝑧 = (𝑥 ∩ 𝑦) → (∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓) ↔ ∀𝑘 ∈ (𝑥 ∩ 𝑦)(𝜑 ∧ 𝜓))) |
24 | 23 | rspcev 2830 |
. . . . . . . . 9
⊢ (((𝑥 ∩ 𝑦) ∈ ran ℤ≥ ∧
∀𝑘 ∈ (𝑥 ∩ 𝑦)(𝜑 ∧ 𝜓)) → ∃𝑧 ∈ ran
ℤ≥∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓)) |
25 | 13, 22, 24 | syl2an 287 |
. . . . . . . 8
⊢ (((𝑥 ∈ ran
ℤ≥ ∧ 𝑦 ∈ ran ℤ≥) ∧
(∀𝑘 ∈ 𝑥 𝜑 ∧ ∀𝑘 ∈ 𝑦 𝜓)) → ∃𝑧 ∈ ran
ℤ≥∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓)) |
26 | 25 | an4s 578 |
. . . . . . 7
⊢ (((𝑥 ∈ ran
ℤ≥ ∧ ∀𝑘 ∈ 𝑥 𝜑) ∧ (𝑦 ∈ ran ℤ≥ ∧
∀𝑘 ∈ 𝑦 𝜓)) → ∃𝑧 ∈ ran
ℤ≥∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓)) |
27 | 26 | rexlimdvaa 2584 |
. . . . . 6
⊢ ((𝑥 ∈ ran
ℤ≥ ∧ ∀𝑘 ∈ 𝑥 𝜑) → (∃𝑦 ∈ ran
ℤ≥∀𝑘 ∈ 𝑦 𝜓 → ∃𝑧 ∈ ran
ℤ≥∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓))) |
28 | 27 | rexlimiva 2578 |
. . . . 5
⊢
(∃𝑥 ∈ ran
ℤ≥∀𝑘 ∈ 𝑥 𝜑 → (∃𝑦 ∈ ran
ℤ≥∀𝑘 ∈ 𝑦 𝜓 → ∃𝑧 ∈ ran
ℤ≥∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓))) |
29 | 28 | imp 123 |
. . . 4
⊢
((∃𝑥 ∈
ran ℤ≥∀𝑘 ∈ 𝑥 𝜑 ∧ ∃𝑦 ∈ ran
ℤ≥∀𝑘 ∈ 𝑦 𝜓) → ∃𝑧 ∈ ran
ℤ≥∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓)) |
30 | | raleq 2661 |
. . . . . 6
⊢ (𝑧 =
(ℤ≥‘𝑗) → (∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓) ↔ ∀𝑘 ∈ (ℤ≥‘𝑗)(𝜑 ∧ 𝜓))) |
31 | 30 | rexrn 5622 |
. . . . 5
⊢
(ℤ≥ Fn ℤ → (∃𝑧 ∈ ran
ℤ≥∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)(𝜑 ∧ 𝜓))) |
32 | 5, 6, 31 | mp2b 8 |
. . . 4
⊢
(∃𝑧 ∈ ran
ℤ≥∀𝑘 ∈ 𝑧 (𝜑 ∧ 𝜓) ↔ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)(𝜑 ∧ 𝜓)) |
33 | 29, 32 | sylib 121 |
. . 3
⊢
((∃𝑥 ∈
ran ℤ≥∀𝑘 ∈ 𝑥 𝜑 ∧ ∃𝑦 ∈ ran
ℤ≥∀𝑘 ∈ 𝑦 𝜓) → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)(𝜑 ∧ 𝜓)) |
34 | 9, 12, 33 | syl2anbr 290 |
. 2
⊢
((∃𝑗 ∈
ℤ ∀𝑘 ∈
(ℤ≥‘𝑗)𝜑 ∧ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓) → ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)(𝜑 ∧ 𝜓)) |
35 | 4, 34 | impbii 125 |
1
⊢
(∃𝑗 ∈
ℤ ∀𝑘 ∈
(ℤ≥‘𝑗)(𝜑 ∧ 𝜓) ↔ (∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜑 ∧ ∃𝑗 ∈ ℤ ∀𝑘 ∈ (ℤ≥‘𝑗)𝜓)) |