Proof of Theorem reccnv
| Step | Hyp | Ref
| Expression |
| 1 | | nnreclt 6074 |
. . . . . 6
⊢ ((x ∈ ℝ ⋀ 0 <
x) → ∃j ∈ ℕ (1 /
j) < x) |
| 2 | 1 | adantl 390 |
. . . . 5
⊢ ((∀k ∈ ℕ (F ‘k) = (1
/ k) ⋀
(x ∈
ℝ ⋀ 0
< x)) → ∃j ∈ ℕ (1 /
j) < x) |
| 3 | | absidt 6862 |
. . . . . . . . . . . . . . . . . . . . 21
⊢ (((1 / k) ∈ ℝ ⋀ 0 ≤ (1 /
k)) → (abs ‘(1 / k)) = (1 / k)) |
| 4 | | nnrecret 5954 |
. . . . . . . . . . . . . . . . . . . . 21
⊢ (k ∈ ℕ → (1 / k) ∈ ℝ) |
| 5 | | 0re 5452 |
. . . . . . . . . . . . . . . . . . . . . . 23
⊢ 0 ∈ ℝ |
| 6 | | ltlet 5532 |
. . . . . . . . . . . . . . . . . . . . . . 23
⊢ ((0 ∈ ℝ ⋀ (1 / k)
∈ ℝ)
→ (0 < (1 / k) → 0 ≤ (1 /
k))) |
| 7 | 5, 6 | mpan 697 |
. . . . . . . . . . . . . . . . . . . . . 22
⊢ ((1 / k) ∈ ℝ → (0 < (1 / k) → 0 ≤ (1 / k))) |
| 8 | | nnrecgt0t 5955 |
. . . . . . . . . . . . . . . . . . . . . 22
⊢ (k ∈ ℕ → 0 < (1 / k)) |
| 9 | 7, 4, 8 | sylc 68 |
. . . . . . . . . . . . . . . . . . . . 21
⊢ (k ∈ ℕ → 0 ≤ (1 / k)) |
| 10 | 3, 4, 9 | sylanc 473 |
. . . . . . . . . . . . . . . . . . . 20
⊢ (k ∈ ℕ → (abs ‘(1 / k)) = (1 / k)) |
| 11 | 10 | ad2antlr 407 |
. . . . . . . . . . . . . . . . . . 19
⊢ (((j ∈ ℕ ⋀ k ∈ ℕ) ⋀ j ≤ k) →
(abs ‘(1 / k)) = (1 / k)) |
| 12 | | lerect 5887 |
. . . . . . . . . . . . . . . . . . . . 21
⊢ (((j ∈ ℝ ⋀ 0 <
j) ⋀
(k ∈
ℝ ⋀ 0
< k)) → (j ≤ k ↔
(1 / k) ≤ (1 / j))) |
| 13 | | nnret 5931 |
. . . . . . . . . . . . . . . . . . . . . 22
⊢ (j ∈ ℕ → j
∈ ℝ) |
| 14 | | nngt0t 5948 |
. . . . . . . . . . . . . . . . . . . . . 22
⊢ (j ∈ ℕ → 0 < j) |
| 15 | 13, 14 | jca 288 |
. . . . . . . . . . . . . . . . . . . . 21
⊢ (j ∈ ℕ → (j
∈ ℝ ⋀ 0 < j)) |
| 16 | | nnret 5931 |
. . . . . . . . . . . . . . . . . . . . . 22
⊢ (k ∈ ℕ → k
∈ ℝ) |
| 17 | | nngt0t 5948 |
. . . . . . . . . . . . . . . . . . . . . 22
⊢ (k ∈ ℕ → 0 < k) |
| 18 | 16, 17 | jca 288 |
. . . . . . . . . . . . . . . . . . . . 21
⊢ (k ∈ ℕ → (k
∈ ℝ ⋀ 0 < k)) |
| 19 | 12, 15, 18 | syl2an 456 |
. . . . . . . . . . . . . . . . . . . 20
⊢ ((j ∈ ℕ ⋀ k ∈ ℕ) → (j
≤ k ↔ (1 / k) ≤ (1 / j))) |
| 20 | 19 | biimpa 418 |
. . . . . . . . . . . . . . . . . . 19
⊢ (((j ∈ ℕ ⋀ k ∈ ℕ) ⋀ j ≤ k) →
(1 / k) ≤ (1 / j)) |
| 21 | 11, 20 | eqbrtrd 2640 |
. . . . . . . . . . . . . . . . . 18
⊢ (((j ∈ ℕ ⋀ k ∈ ℕ) ⋀ j ≤ k) →
(abs ‘(1 / k)) ≤ (1 / j)) |
| 22 | 21 | adantlll 398 |
. . . . . . . . . . . . . . . . 17
⊢ (((((x ∈ ℝ ⋀ 0 <
x) ⋀
j ∈ ℕ) ⋀ k ∈ ℕ) ⋀ j ≤ k) →
(abs ‘(1 / k)) ≤ (1 / j)) |
| 23 | | lelttrt 5535 |
. . . . . . . . . . . . . . . . . . . 20
⊢ (((abs ‘(1 /
k)) ∈
ℝ ⋀ (1 /
j) ∈
ℝ ⋀
x ∈ ℝ) → (((abs ‘(1 / k)) ≤ (1 / j)
⋀ (1 / j) < x)
→ (abs ‘(1 / k)) < x)) |
| 24 | 4 | recnd 5327 |
. . . . . . . . . . . . . . . . . . . . . 22
⊢ (k ∈ ℕ → (1 / k) ∈ ℂ) |
| 25 | | absclt 6833 |
. . . . . . . . . . . . . . . . . . . . . 22
⊢ ((1 / k) ∈ ℂ → (abs ‘(1 / k)) ∈ ℝ) |
| 26 | 24, 25 | syl 10 |
. . . . . . . . . . . . . . . . . . . . 21
⊢ (k ∈ ℕ → (abs ‘(1 / k)) ∈ ℝ) |
| 27 | 26 | adantl 390 |
. . . . . . . . . . . . . . . . . . . 20
⊢ (((x ∈ ℝ ⋀ j ∈ ℕ) ⋀ k ∈ ℕ) → (abs ‘(1 / k)) ∈ ℝ) |
| 28 | | nnrecret 5954 |
. . . . . . . . . . . . . . . . . . . . 21
⊢ (j ∈ ℕ → (1 / j) ∈ ℝ) |
| 29 | 28 | ad2antlr 407 |
. . . . . . . . . . . . . . . . . . . 20
⊢ (((x ∈ ℝ ⋀ j ∈ ℕ) ⋀ k ∈ ℕ) → (1 / j) ∈ ℝ) |
| 30 | | simpll 414 |
. . . . . . . . . . . . . . . . . . . 20
⊢ (((x ∈ ℝ ⋀ j ∈ ℕ) ⋀ k ∈ ℕ) → x
∈ ℝ) |
| 31 | 23, 27, 29, 30 | syl3anc 860 |
. . . . . . . . . . . . . . . . . . 19
⊢ (((x ∈ ℝ ⋀ j ∈ ℕ) ⋀ k ∈ ℕ) → (((abs ‘(1 / k)) ≤ (1 / j)
⋀ (1 / j) < x)
→ (abs ‘(1 / k)) < x)) |
| 32 | 31 | adantllr 399 |
. . . . . . . . . . . . . . . . . 18
⊢ ((((x ∈ ℝ ⋀ 0 <
x) ⋀
j ∈ ℕ) ⋀ k ∈ ℕ) → (((abs ‘(1 / k)) ≤ (1 / j)
⋀ (1 / j) < x)
→ (abs ‘(1 / k)) < x)) |
| 33 | 32 | adantr 391 |
. . . . . . . . . . . . . . . . 17
⊢ (((((x ∈ ℝ ⋀ 0 <
x) ⋀
j ∈ ℕ) ⋀ k ∈ ℕ) ⋀ j ≤ k) →
(((abs ‘(1 / k)) ≤ (1 / j) ⋀ (1 /
j) < x) → (abs ‘(1 / k)) < x)) |
| 34 | 22, 33 | mpand 703 |
. . . . . . . . . . . . . . . 16
⊢ (((((x ∈ ℝ ⋀ 0 <
x) ⋀
j ∈ ℕ) ⋀ k ∈ ℕ) ⋀ j ≤ k) →
((1 / j) < x → (abs ‘(1 / k)) < x)) |
| 35 | 34 | exp31 378 |
. . . . . . . . . . . . . . 15
⊢ (((x ∈ ℝ ⋀ 0 <
x) ⋀
j ∈ ℕ) → (k
∈ ℕ →
(j ≤ k → ((1 / j) < x →
(abs ‘(1 / k)) < x)))) |
| 36 | 35 | com23 32 |
. . . . . . . . . . . . . 14
⊢ (((x ∈ ℝ ⋀ 0 <
x) ⋀
j ∈ ℕ) → (j
≤ k → (k ∈ ℕ → ((1 / j) < x →
(abs ‘(1 / k)) < x)))) |
| 37 | 36 | com24 37 |
. . . . . . . . . . . . 13
⊢ (((x ∈ ℝ ⋀ 0 <
x) ⋀
j ∈ ℕ) → ((1 / j) < x →
(k ∈
ℕ → (j ≤ k →
(abs ‘(1 / k)) < x)))) |
| 38 | 37 | ex 373 |
. . . . . . . . . . . 12
⊢ ((x ∈ ℝ ⋀ 0 <
x) → (j ∈ ℕ → ((1 / j) < x →
(k ∈
ℕ → (j ≤ k →
(abs ‘(1 / k)) < x))))) |
| 39 | 38 | imp42 369 |
. . . . . . . . . . 11
⊢ ((((x ∈ ℝ ⋀ 0 <
x) ⋀
(j ∈
ℕ ⋀ (1 /
j) < x)) ⋀ k ∈ ℕ) → (j
≤ k → (abs ‘(1 / k)) < x)) |
| 40 | | fveq2 3730 |
. . . . . . . . . . . . 13
⊢ ((F ‘k) = (1
/ k) → (abs ‘(F ‘k)) =
(abs ‘(1 / k))) |
| 41 | 40 | breq1d 2634 |
. . . . . . . . . . . 12
⊢ ((F ‘k) = (1
/ k) → ((abs ‘(F ‘k))
< x ↔ (abs ‘(1 / k)) < x)) |
| 42 | 41 | biimprd 154 |
. . . . . . . . . . 11
⊢ ((F ‘k) = (1
/ k) → ((abs ‘(1 / k)) < x
→ (abs ‘(F ‘k)) < x)) |
| 43 | 39, 42 | syl9 57 |
. . . . . . . . . 10
⊢ ((((x ∈ ℝ ⋀ 0 <
x) ⋀
(j ∈
ℕ ⋀ (1 /
j) < x)) ⋀ k ∈ ℕ) → ((F
‘k) = (1 / k) → (j
≤ k → (abs ‘(F ‘k))
< x))) |
| 44 | 43 | r19.20dva 1712 |
. . . . . . . . 9
⊢ (((x ∈ ℝ ⋀ 0 <
x) ⋀
(j ∈
ℕ ⋀ (1 /
j) < x)) → (∀k ∈ ℕ (F ‘k) = (1
/ k) → ∀k ∈ ℕ (j ≤ k →
(abs ‘(F ‘k)) < x))) |
| 45 | 44 | exp32 379 |
. . . . . . . 8
⊢ ((x ∈ ℝ ⋀ 0 <
x) → (j ∈ ℕ → ((1 / j) < x →
(∀k
∈ ℕ
(F ‘k) = (1 / k)
→ ∀k ∈ ℕ (j ≤
k → (abs ‘(F ‘k))
< x))))) |
| 46 | 45 | com4r 41 |
. . . . . . 7
⊢ (∀k ∈ ℕ (F ‘k) = (1
/ k) → ((x ∈ ℝ ⋀ 0 <
x) → (j ∈ ℕ → ((1 / j) < x →
∀k
∈ ℕ
(j ≤ k → (abs ‘(F ‘k))
< x))))) |
| 47 | 46 | imp 350 |
. . . . . 6
⊢ ((∀k ∈ ℕ (F ‘k) = (1
/ k) ⋀
(x ∈
ℝ ⋀ 0
< x)) → (j ∈ ℕ → ((1 / j) < x →
∀k
∈ ℕ
(j ≤ k → (abs ‘(F ‘k))
< x)))) |
| 48 | 47 | r19.22dv 1740 |
. . . . 5
⊢ ((∀k ∈ ℕ (F ‘k) = (1
/ k) ⋀
(x ∈
ℝ ⋀ 0
< x)) → (∃j ∈ ℕ (1 /
j) < x → ∃j ∈ ℕ ∀k ∈ ℕ (j ≤ k →
(abs ‘(F ‘k)) < x))) |
| 49 | 2, 48 | mpd 26 |
. . . 4
⊢ ((∀k ∈ ℕ (F ‘k) = (1
/ k) ⋀
(x ∈
ℝ ⋀ 0
< x)) → ∃j ∈ ℕ ∀k ∈ ℕ (j ≤ k →
(abs ‘(F ‘k)) < x)) |
| 50 | 49 | exp32 379 |
. . 3
⊢ (∀k ∈ ℕ (F ‘k) = (1
/ k) → (x ∈ ℝ → (0 < x → ∃j ∈ ℕ ∀k ∈ ℕ (j ≤ k →
(abs ‘(F ‘k)) < x)))) |
| 51 | 50 | r19.21aiv 1716 |
. 2
⊢ (∀k ∈ ℕ (F ‘k) = (1
/ k) → ∀x ∈ ℝ (0 <
x → ∃j ∈ ℕ ∀k ∈ ℕ (j ≤ k →
(abs ‘(F ‘k)) < x))) |
| 52 | | eleq1 1537 |
. . . . 5
⊢ ((F ‘k) = (1
/ k) → ((F ‘k)
∈ ℂ ↔
(1 / k) ∈
ℂ)) |
| 53 | 52, 24 | syl5cbir 211 |
. . . 4
⊢ (k ∈ ℕ → ((F
‘k) = (1 / k) → (F
‘k) ∈ ℂ)) |
| 54 | 53 | r19.20i 1707 |
. . 3
⊢ (∀k ∈ ℕ (F ‘k) = (1
/ k) → ∀k ∈ ℕ (F ‘k)
∈ ℂ) |
| 55 | | 1z 6161 |
. . . 4
⊢ 1 ∈ ℤ |
| 56 | | nnuz 6440 |
. . . . 5
⊢ ℕ = (ℤ≥ ‘1) |
| 57 | 56 | eqimss2i 2115 |
. . . 4
⊢ (ℤ≥ ‘1) ⊆ ℕ |
| 58 | | nnssz 6153 |
. . . 4
⊢ ℕ ⊆ ℤ |
| 59 | | reccnv.1 |
. . . 4
⊢ F ∈
V |
| 60 | 55, 57, 58, 55, 57, 58, 59 | clm0 7083 |
. . 3
⊢ (∀k ∈ ℕ (F ‘k)
∈ ℂ →
(F ⇝ 0
↔ ∀x ∈ ℝ (0 < x
→ ∃j ∈ ℕ ∀k ∈ ℕ (j ≤
k → (abs ‘(F ‘k))
< x)))) |
| 61 | 54, 60 | syl 10 |
. 2
⊢ (∀k ∈ ℕ (F ‘k) = (1
/ k) → (F ⇝ 0 ↔
∀x
∈ ℝ (0
< x → ∃j ∈ ℕ ∀k ∈ ℕ (j ≤ k →
(abs ‘(F ‘k)) < x)))) |
| 62 | 51, 61 | mpbird 196 |
1
⊢ (∀k ∈ ℕ (F ‘k) = (1
/ k) → F ⇝ 0) |