Proof of Theorem preimageiingt
| Step | Hyp | Ref
| Expression |
| 1 | | preimageiingt.x |
. . . 4
⊢
Ⅎ𝑥𝜑 |
| 2 | | simpllr 775 |
. . . . . . . 8
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝑥 ∈ 𝐴) |
| 3 | | preimageiingt.c |
. . . . . . . . . . . . 13
⊢ (𝜑 → 𝐶 ∈ ℝ) |
| 4 | 3 | adantr 480 |
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → 𝐶 ∈ ℝ) |
| 5 | | nnrecre 12178 |
. . . . . . . . . . . . 13
⊢ (𝑛 ∈ ℕ → (1 /
𝑛) ∈
ℝ) |
| 6 | 5 | adantl 481 |
. . . . . . . . . . . 12
⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈
ℝ) |
| 7 | 4, 6 | resubcld 11556 |
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐶 − (1 / 𝑛)) ∈ ℝ) |
| 8 | 7 | rexrd 11173 |
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐶 − (1 / 𝑛)) ∈
ℝ*) |
| 9 | 8 | ad4ant14 752 |
. . . . . . . . 9
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐶 − (1 / 𝑛)) ∈
ℝ*) |
| 10 | 3 | rexrd 11173 |
. . . . . . . . . 10
⊢ (𝜑 → 𝐶 ∈
ℝ*) |
| 11 | 10 | ad3antrrr 730 |
. . . . . . . . 9
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐶 ∈
ℝ*) |
| 12 | | preimageiingt.b |
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 ∈
ℝ*) |
| 13 | 12 | ad2antrr 726 |
. . . . . . . . 9
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐵 ∈
ℝ*) |
| 14 | | nnrecrp 45546 |
. . . . . . . . . . . 12
⊢ (𝑛 ∈ ℕ → (1 /
𝑛) ∈
ℝ+) |
| 15 | 14 | adantl 481 |
. . . . . . . . . . 11
⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (1 / 𝑛) ∈
ℝ+) |
| 16 | 4, 15 | ltsubrpd 12972 |
. . . . . . . . . 10
⊢ ((𝜑 ∧ 𝑛 ∈ ℕ) → (𝐶 − (1 / 𝑛)) < 𝐶) |
| 17 | 16 | ad4ant14 752 |
. . . . . . . . 9
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐶 − (1 / 𝑛)) < 𝐶) |
| 18 | | simplr 768 |
. . . . . . . . 9
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝐶 ≤ 𝐵) |
| 19 | 9, 11, 13, 17, 18 | xrltletrd 13066 |
. . . . . . . 8
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → (𝐶 − (1 / 𝑛)) < 𝐵) |
| 20 | 2, 19 | rabidd 45315 |
. . . . . . 7
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) ∧ 𝑛 ∈ ℕ) → 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵}) |
| 21 | 20 | ralrimiva 3125 |
. . . . . 6
⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) → ∀𝑛 ∈ ℕ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵}) |
| 22 | | eliin 4948 |
. . . . . . 7
⊢ (𝑥 ∈ V → (𝑥 ∈ ∩ 𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵} ↔ ∀𝑛 ∈ ℕ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵})) |
| 23 | 22 | elv 3442 |
. . . . . 6
⊢ (𝑥 ∈ ∩ 𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵} ↔ ∀𝑛 ∈ ℕ 𝑥 ∈ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵}) |
| 24 | 21, 23 | sylibr 234 |
. . . . 5
⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝐶 ≤ 𝐵) → 𝑥 ∈ ∩
𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵}) |
| 25 | 24 | ex 412 |
. . . 4
⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝐶 ≤ 𝐵 → 𝑥 ∈ ∩
𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵})) |
| 26 | 1, 25 | ralrimia 3232 |
. . 3
⊢ (𝜑 → ∀𝑥 ∈ 𝐴 (𝐶 ≤ 𝐵 → 𝑥 ∈ ∩
𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵})) |
| 27 | | nfcv 2895 |
. . . . 5
⊢
Ⅎ𝑥ℕ |
| 28 | | nfrab1 3416 |
. . . . 5
⊢
Ⅎ𝑥{𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵} |
| 29 | 27, 28 | nfiin 4976 |
. . . 4
⊢
Ⅎ𝑥∩ 𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵} |
| 30 | 29 | rabssf 45279 |
. . 3
⊢ ({𝑥 ∈ 𝐴 ∣ 𝐶 ≤ 𝐵} ⊆ ∩ 𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵} ↔ ∀𝑥 ∈ 𝐴 (𝐶 ≤ 𝐵 → 𝑥 ∈ ∩
𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵})) |
| 31 | 26, 30 | sylibr 234 |
. 2
⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ 𝐶 ≤ 𝐵} ⊆ ∩ 𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵}) |
| 32 | | nnn0 45538 |
. . . 4
⊢ ℕ
≠ ∅ |
| 33 | | iinrab 5021 |
. . . 4
⊢ (ℕ
≠ ∅ → ∩ 𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵} = {𝑥 ∈ 𝐴 ∣ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵}) |
| 34 | 32, 33 | ax-mp 5 |
. . 3
⊢ ∩ 𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵} = {𝑥 ∈ 𝐴 ∣ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵} |
| 35 | 8 | ad4ant13 751 |
. . . . . . . . . 10
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑛 ∈ ℕ) ∧ (𝐶 − (1 / 𝑛)) < 𝐵) → (𝐶 − (1 / 𝑛)) ∈
ℝ*) |
| 36 | 12 | ad2antrr 726 |
. . . . . . . . . 10
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑛 ∈ ℕ) ∧ (𝐶 − (1 / 𝑛)) < 𝐵) → 𝐵 ∈
ℝ*) |
| 37 | | simpr 484 |
. . . . . . . . . 10
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑛 ∈ ℕ) ∧ (𝐶 − (1 / 𝑛)) < 𝐵) → (𝐶 − (1 / 𝑛)) < 𝐵) |
| 38 | 35, 36, 37 | xrltled 13055 |
. . . . . . . . 9
⊢ ((((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑛 ∈ ℕ) ∧ (𝐶 − (1 / 𝑛)) < 𝐵) → (𝐶 − (1 / 𝑛)) ≤ 𝐵) |
| 39 | 38 | ex 412 |
. . . . . . . 8
⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ 𝑛 ∈ ℕ) → ((𝐶 − (1 / 𝑛)) < 𝐵 → (𝐶 − (1 / 𝑛)) ≤ 𝐵)) |
| 40 | 39 | ralimdva 3145 |
. . . . . . 7
⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵 → ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) ≤ 𝐵)) |
| 41 | 40 | imp 406 |
. . . . . 6
⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵) → ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) ≤ 𝐵) |
| 42 | | nfv 1915 |
. . . . . . . 8
⊢
Ⅎ𝑛(𝜑 ∧ 𝑥 ∈ 𝐴) |
| 43 | | nfra1 3257 |
. . . . . . . 8
⊢
Ⅎ𝑛∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵 |
| 44 | 42, 43 | nfan 1900 |
. . . . . . 7
⊢
Ⅎ𝑛((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵) |
| 45 | 3 | ad2antrr 726 |
. . . . . . 7
⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵) → 𝐶 ∈ ℝ) |
| 46 | 12 | adantr 480 |
. . . . . . 7
⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵) → 𝐵 ∈
ℝ*) |
| 47 | 44, 45, 46 | xrralrecnnge 45550 |
. . . . . 6
⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵) → (𝐶 ≤ 𝐵 ↔ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) ≤ 𝐵)) |
| 48 | 41, 47 | mpbird 257 |
. . . . 5
⊢ (((𝜑 ∧ 𝑥 ∈ 𝐴) ∧ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵) → 𝐶 ≤ 𝐵) |
| 49 | 48 | ex 412 |
. . . 4
⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵 → 𝐶 ≤ 𝐵)) |
| 50 | 1, 49 | ss2rabdf 45310 |
. . 3
⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ ∀𝑛 ∈ ℕ (𝐶 − (1 / 𝑛)) < 𝐵} ⊆ {𝑥 ∈ 𝐴 ∣ 𝐶 ≤ 𝐵}) |
| 51 | 34, 50 | eqsstrid 3969 |
. 2
⊢ (𝜑 → ∩ 𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵} ⊆ {𝑥 ∈ 𝐴 ∣ 𝐶 ≤ 𝐵}) |
| 52 | 31, 51 | eqssd 3948 |
1
⊢ (𝜑 → {𝑥 ∈ 𝐴 ∣ 𝐶 ≤ 𝐵} = ∩
𝑛 ∈ ℕ {𝑥 ∈ 𝐴 ∣ (𝐶 − (1 / 𝑛)) < 𝐵}) |