Proof of Theorem clim0
| Step | Hyp | Ref
| Expression |
| 1 | | 0cn 4100 |
. . . . . . 7
⊢ 0 ∈ ℂ |
| 2 | 1 | elisseti 1355 |
. . . . . 6
⊢ 0 ∈ V |
| 3 | 2 | fconst 2774 |
. . . . 5
⊢ (ℕ ×
{0}):ℕ–→{0} |
| 4 | | snssi 1851 |
. . . . . 6
⊢ (0 ∈ ℂ → {0} ⊆
ℂ) |
| 5 | 1, 4 | ax-mp 6 |
. . . . 5
⊢ {0} ⊆ ℂ |
| 6 | | fss 2759 |
. . . . 5
⊢ (((ℕ ×
{0}):ℕ–→{0} ∧ {0} ⊆ ℂ) → (ℕ ×
{0}):ℕ–→ℂ) |
| 7 | 3, 5, 6 | mp2an 520 |
. . . 4
⊢ (ℕ ×
{0}):ℕ–→ℂ |
| 8 | 7, 1 | pm3.2i 234 |
. . 3
⊢ ((ℕ ×
{0}):ℕ–→ℂ ∧ 0 ∈ ℂ) |
| 9 | | fvconst 2899 |
. . . . . . . . . . . . . . . . 17
⊢ (((ℕ ×
{0}):ℕ–→{0} ∧ z ∈
ℕ) → ((ℕ × {0}) ‘z) = 0) |
| 10 | 3, 9 | mpan 518 |
. . . . . . . . . . . . . . . 16
⊢ (z
∈ ℕ → ((ℕ × {0}) ‘z) = 0) |
| 11 | 10 | opreq1d 3012 |
. . . . . . . . . . . . . . 15
⊢ (z
∈ ℕ → (((ℕ × {0}) ‘z) − 0) = (0 − 0)) |
| 12 | 1 | subid 4155 |
. . . . . . . . . . . . . . 15
⊢ (0 − 0) = 0 |
| 13 | 11, 12 | syl6eq 1140 |
. . . . . . . . . . . . . 14
⊢ (z
∈ ℕ → (((ℕ × {0}) ‘z) − 0) = 0) |
| 14 | 13 | fveq2d 2836 |
. . . . . . . . . . . . 13
⊢ (z
∈ ℕ → (abs ‘(((ℕ × {0}) ‘z) − 0)) = (abs ‘0)) |
| 15 | | cleqid 1102 |
. . . . . . . . . . . . . 14
⊢ 0 = 0 |
| 16 | 1 | abs00 4839 |
. . . . . . . . . . . . . 14
⊢ ((abs ‘0) = 0 ↔ 0 =
0) |
| 17 | 15, 16 | mpbir 165 |
. . . . . . . . . . . . 13
⊢ (abs ‘0) = 0 |
| 18 | 14, 17 | syl6eq 1140 |
. . . . . . . . . . . 12
⊢ (z
∈ ℕ → (abs ‘(((ℕ × {0}) ‘z) − 0)) = 0) |
| 19 | 18 | breq1d 2071 |
. . . . . . . . . . 11
⊢ (z
∈ ℕ → ((abs ‘(((ℕ × {0}) ‘z) − 0)) < x ↔ 0 < x)) |
| 20 | 19 | biimprd 136 |
. . . . . . . . . 10
⊢ (z
∈ ℕ → (0 < x → (abs
‘(((ℕ × {0}) ‘z)
− 0)) < x)) |
| 21 | 20 | a1d 14 |
. . . . . . . . 9
⊢ (z
∈ ℕ → (1 ≤ z → (0
< x → (abs ‘(((ℕ
× {0}) ‘z) − 0)) <
x))) |
| 22 | 21 | com3r 35 |
. . . . . . . 8
⊢ (0 < x → (z
∈ ℕ → (1 ≤ z → (abs
‘(((ℕ × {0}) ‘z)
− 0)) < x))) |
| 23 | 22 | r19.21aiv 1259 |
. . . . . . 7
⊢ (0 < x → ∀z ∈ ℕ (1 ≤ z → (abs ‘(((ℕ × {0})
‘z) − 0)) < x)) |
| 24 | | 1nn 4432 |
. . . . . . 7
⊢ 1 ∈ ℕ |
| 25 | 23, 24 | jctil 240 |
. . . . . 6
⊢ (0 < x → (1 ∈ ℕ ∧ ∀z ∈ ℕ (1 ≤ z → (abs ‘(((ℕ × {0})
‘z) − 0)) < x))) |
| 26 | | breq1 2065 |
. . . . . . . . 9
⊢ (y = 1
→ (y ≤ z ↔ 1 ≤ z)) |
| 27 | 26 | imbi1d 465 |
. . . . . . . 8
⊢ (y = 1
→ ((y ≤ z → (abs ‘(((ℕ × {0})
‘z) − 0)) < x) ↔ (1 ≤ z → (abs ‘(((ℕ × {0})
‘z) − 0)) < x))) |
| 28 | 27 | biraldv 1219 |
. . . . . . 7
⊢ (y = 1
→ (∀z ∈ ℕ (y ≤ z →
(abs ‘(((ℕ × {0}) ‘z) − 0)) < x) ↔ ∀z ∈ ℕ (1 ≤ z → (abs ‘(((ℕ × {0})
‘z) − 0)) < x))) |
| 29 | 28 | rcla4ev 1403 |
. . . . . 6
⊢ ((1 ∈ ℕ ∧ ∀z ∈ ℕ (1 ≤ z → (abs ‘(((ℕ × {0})
‘z) − 0)) < x)) → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(abs ‘(((ℕ × {0}) ‘z) − 0)) < x)) |
| 30 | 25, 29 | syl 12 |
. . . . 5
⊢ (0 < x → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(abs ‘(((ℕ × {0}) ‘z) − 0)) < x)) |
| 31 | 30 | a1i 7 |
. . . 4
⊢ (x
∈ ℝ → (0 < x →
∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(abs ‘(((ℕ × {0}) ‘z) − 0)) < x))) |
| 32 | 31 | rgen 1247 |
. . 3
⊢ ∀x ∈ ℝ (0 < x → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(abs ‘(((ℕ × {0}) ‘z) − 0)) < x)) |
| 33 | 8, 32 | pm3.2i 234 |
. 2
⊢ (((ℕ ×
{0}):ℕ–→ℂ ∧ 0 ∈ ℂ) ∧ ∀x ∈ ℝ (0 < x → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(abs ‘(((ℕ × {0}) ‘z) − 0)) < x))) |
| 34 | | nnex 4431 |
. . . 4
⊢ ℕ ∈ V |
| 35 | | snex 1859 |
. . . 4
⊢ {0} ∈ V |
| 36 | 34, 35 | xpex 2488 |
. . 3
⊢ (ℕ × {0}) ∈
V |
| 37 | 36, 2 | clim 4877 |
. 2
⊢ ((ℕ × {0}) ⇝ 0 ↔
(((ℕ × {0}):ℕ–→ℂ ∧ 0 ∈ ℂ)
∧ ∀x ∈ ℝ (0 <
x → ∃y ∈ ℕ ∀z ∈ ℕ (y ≤ z →
(abs ‘(((ℕ × {0}) ‘z) − 0)) < x)))) |
| 38 | 33, 37 | mpbir 165 |
1
⊢ (ℕ × {0}) ⇝ 0 |