Proof of Theorem chto1ub
| Step | Hyp | Ref
| Expression |
| 1 | | rpssre 11843 |
. . . 4
⊢
ℝ+ ⊆ ℝ |
| 2 | 1 | a1i 11 |
. . 3
⊢ (⊤
→ ℝ+ ⊆ ℝ) |
| 3 | | rpre 11839 |
. . . . . . 7
⊢ (𝑥 ∈ ℝ+
→ 𝑥 ∈
ℝ) |
| 4 | | chtcl 24835 |
. . . . . . 7
⊢ (𝑥 ∈ ℝ →
(θ‘𝑥) ∈
ℝ) |
| 5 | 3, 4 | syl 17 |
. . . . . 6
⊢ (𝑥 ∈ ℝ+
→ (θ‘𝑥)
∈ ℝ) |
| 6 | | rerpdivcl 11861 |
. . . . . 6
⊢
(((θ‘𝑥)
∈ ℝ ∧ 𝑥
∈ ℝ+) → ((θ‘𝑥) / 𝑥) ∈ ℝ) |
| 7 | 5, 6 | mpancom 703 |
. . . . 5
⊢ (𝑥 ∈ ℝ+
→ ((θ‘𝑥) /
𝑥) ∈
ℝ) |
| 8 | 7 | recnd 10068 |
. . . 4
⊢ (𝑥 ∈ ℝ+
→ ((θ‘𝑥) /
𝑥) ∈
ℂ) |
| 9 | 8 | adantl 482 |
. . 3
⊢
((⊤ ∧ 𝑥
∈ ℝ+) → ((θ‘𝑥) / 𝑥) ∈ ℂ) |
| 10 | | 3re 11094 |
. . . 4
⊢ 3 ∈
ℝ |
| 11 | 10 | a1i 11 |
. . 3
⊢ (⊤
→ 3 ∈ ℝ) |
| 12 | | 2rp 11837 |
. . . . . 6
⊢ 2 ∈
ℝ+ |
| 13 | | relogcl 24322 |
. . . . . 6
⊢ (2 ∈
ℝ+ → (log‘2) ∈ ℝ) |
| 14 | 12, 13 | ax-mp 5 |
. . . . 5
⊢
(log‘2) ∈ ℝ |
| 15 | | 2re 11090 |
. . . . 5
⊢ 2 ∈
ℝ |
| 16 | 14, 15 | remulcli 10054 |
. . . 4
⊢
((log‘2) · 2) ∈ ℝ |
| 17 | 16 | a1i 11 |
. . 3
⊢ (⊤
→ ((log‘2) · 2) ∈ ℝ) |
| 18 | | chtge0 24838 |
. . . . . . . . 9
⊢ (𝑥 ∈ ℝ → 0 ≤
(θ‘𝑥)) |
| 19 | 3, 18 | syl 17 |
. . . . . . . 8
⊢ (𝑥 ∈ ℝ+
→ 0 ≤ (θ‘𝑥)) |
| 20 | | rpregt0 11846 |
. . . . . . . 8
⊢ (𝑥 ∈ ℝ+
→ (𝑥 ∈ ℝ
∧ 0 < 𝑥)) |
| 21 | | divge0 10892 |
. . . . . . . 8
⊢
((((θ‘𝑥)
∈ ℝ ∧ 0 ≤ (θ‘𝑥)) ∧ (𝑥 ∈ ℝ ∧ 0 < 𝑥)) → 0 ≤
((θ‘𝑥) / 𝑥)) |
| 22 | 5, 19, 20, 21 | syl21anc 1325 |
. . . . . . 7
⊢ (𝑥 ∈ ℝ+
→ 0 ≤ ((θ‘𝑥) / 𝑥)) |
| 23 | 7, 22 | absidd 14161 |
. . . . . 6
⊢ (𝑥 ∈ ℝ+
→ (abs‘((θ‘𝑥) / 𝑥)) = ((θ‘𝑥) / 𝑥)) |
| 24 | 23 | adantr 481 |
. . . . 5
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(abs‘((θ‘𝑥) / 𝑥)) = ((θ‘𝑥) / 𝑥)) |
| 25 | 7 | adantr 481 |
. . . . . 6
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
((θ‘𝑥) / 𝑥) ∈
ℝ) |
| 26 | 16 | a1i 11 |
. . . . . 6
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
((log‘2) · 2) ∈ ℝ) |
| 27 | 5 | adantr 481 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(θ‘𝑥) ∈
ℝ) |
| 28 | 3 | adantr 481 |
. . . . . . . . . . . 12
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
𝑥 ∈
ℝ) |
| 29 | | remulcl 10021 |
. . . . . . . . . . . 12
⊢ ((2
∈ ℝ ∧ 𝑥
∈ ℝ) → (2 · 𝑥) ∈ ℝ) |
| 30 | 15, 28, 29 | sylancr 695 |
. . . . . . . . . . 11
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → (2
· 𝑥) ∈
ℝ) |
| 31 | | resubcl 10345 |
. . . . . . . . . . 11
⊢ (((2
· 𝑥) ∈ ℝ
∧ 3 ∈ ℝ) → ((2 · 𝑥) − 3) ∈ ℝ) |
| 32 | 30, 10, 31 | sylancl 694 |
. . . . . . . . . 10
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → ((2
· 𝑥) − 3)
∈ ℝ) |
| 33 | | remulcl 10021 |
. . . . . . . . . 10
⊢
(((log‘2) ∈ ℝ ∧ ((2 · 𝑥) − 3) ∈ ℝ) →
((log‘2) · ((2 · 𝑥) − 3)) ∈
ℝ) |
| 34 | 14, 32, 33 | sylancr 695 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
((log‘2) · ((2 · 𝑥) − 3)) ∈
ℝ) |
| 35 | | remulcl 10021 |
. . . . . . . . . 10
⊢
(((log‘2) ∈ ℝ ∧ (2 · 𝑥) ∈ ℝ) → ((log‘2)
· (2 · 𝑥))
∈ ℝ) |
| 36 | 14, 30, 35 | sylancr 695 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
((log‘2) · (2 · 𝑥)) ∈ ℝ) |
| 37 | 15 | a1i 11 |
. . . . . . . . . . 11
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → 2
∈ ℝ) |
| 38 | 10 | a1i 11 |
. . . . . . . . . . 11
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → 3
∈ ℝ) |
| 39 | | 2lt3 11195 |
. . . . . . . . . . . 12
⊢ 2 <
3 |
| 40 | 39 | a1i 11 |
. . . . . . . . . . 11
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → 2
< 3) |
| 41 | | simpr 477 |
. . . . . . . . . . 11
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → 3
≤ 𝑥) |
| 42 | 37, 38, 28, 40, 41 | ltletrd 10197 |
. . . . . . . . . 10
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → 2
< 𝑥) |
| 43 | | chtub 24937 |
. . . . . . . . . 10
⊢ ((𝑥 ∈ ℝ ∧ 2 <
𝑥) →
(θ‘𝑥) <
((log‘2) · ((2 · 𝑥) − 3))) |
| 44 | 28, 42, 43 | syl2anc 693 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(θ‘𝑥) <
((log‘2) · ((2 · 𝑥) − 3))) |
| 45 | | 3pos 11114 |
. . . . . . . . . . . 12
⊢ 0 <
3 |
| 46 | 10, 45 | elrpii 11835 |
. . . . . . . . . . 11
⊢ 3 ∈
ℝ+ |
| 47 | | ltsubrp 11866 |
. . . . . . . . . . 11
⊢ (((2
· 𝑥) ∈ ℝ
∧ 3 ∈ ℝ+) → ((2 · 𝑥) − 3) < (2 · 𝑥)) |
| 48 | 30, 46, 47 | sylancl 694 |
. . . . . . . . . 10
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → ((2
· 𝑥) − 3) <
(2 · 𝑥)) |
| 49 | | 1lt2 11194 |
. . . . . . . . . . . . . 14
⊢ 1 <
2 |
| 50 | | rplogcl 24350 |
. . . . . . . . . . . . . 14
⊢ ((2
∈ ℝ ∧ 1 < 2) → (log‘2) ∈
ℝ+) |
| 51 | 15, 49, 50 | mp2an 708 |
. . . . . . . . . . . . 13
⊢
(log‘2) ∈ ℝ+ |
| 52 | | elrp 11834 |
. . . . . . . . . . . . 13
⊢
((log‘2) ∈ ℝ+ ↔ ((log‘2) ∈
ℝ ∧ 0 < (log‘2))) |
| 53 | 51, 52 | mpbi 220 |
. . . . . . . . . . . 12
⊢
((log‘2) ∈ ℝ ∧ 0 <
(log‘2)) |
| 54 | 53 | a1i 11 |
. . . . . . . . . . 11
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
((log‘2) ∈ ℝ ∧ 0 < (log‘2))) |
| 55 | | ltmul2 10874 |
. . . . . . . . . . 11
⊢ ((((2
· 𝑥) − 3)
∈ ℝ ∧ (2 · 𝑥) ∈ ℝ ∧ ((log‘2) ∈
ℝ ∧ 0 < (log‘2))) → (((2 · 𝑥) − 3) < (2 · 𝑥) ↔ ((log‘2) ·
((2 · 𝑥) − 3))
< ((log‘2) · (2 · 𝑥)))) |
| 56 | 32, 30, 54, 55 | syl3anc 1326 |
. . . . . . . . . 10
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → (((2
· 𝑥) − 3) <
(2 · 𝑥) ↔
((log‘2) · ((2 · 𝑥) − 3)) < ((log‘2) · (2
· 𝑥)))) |
| 57 | 48, 56 | mpbid 222 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
((log‘2) · ((2 · 𝑥) − 3)) < ((log‘2) · (2
· 𝑥))) |
| 58 | 27, 34, 36, 44, 57 | lttrd 10198 |
. . . . . . . 8
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(θ‘𝑥) <
((log‘2) · (2 · 𝑥))) |
| 59 | 14 | recni 10052 |
. . . . . . . . . 10
⊢
(log‘2) ∈ ℂ |
| 60 | 59 | a1i 11 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(log‘2) ∈ ℂ) |
| 61 | | 2cnd 11093 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) → 2
∈ ℂ) |
| 62 | 3 | recnd 10068 |
. . . . . . . . . 10
⊢ (𝑥 ∈ ℝ+
→ 𝑥 ∈
ℂ) |
| 63 | 62 | adantr 481 |
. . . . . . . . 9
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
𝑥 ∈
ℂ) |
| 64 | 60, 61, 63 | mulassd 10063 |
. . . . . . . 8
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(((log‘2) · 2) · 𝑥) = ((log‘2) · (2 · 𝑥))) |
| 65 | 58, 64 | breqtrrd 4681 |
. . . . . . 7
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(θ‘𝑥) <
(((log‘2) · 2) · 𝑥)) |
| 66 | 20 | adantr 481 |
. . . . . . . 8
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(𝑥 ∈ ℝ ∧ 0
< 𝑥)) |
| 67 | | ltdivmul2 10900 |
. . . . . . . 8
⊢
(((θ‘𝑥)
∈ ℝ ∧ ((log‘2) · 2) ∈ ℝ ∧ (𝑥 ∈ ℝ ∧ 0 <
𝑥)) →
(((θ‘𝑥) / 𝑥) < ((log‘2) ·
2) ↔ (θ‘𝑥)
< (((log‘2) · 2) · 𝑥))) |
| 68 | 27, 26, 66, 67 | syl3anc 1326 |
. . . . . . 7
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(((θ‘𝑥) / 𝑥) < ((log‘2) ·
2) ↔ (θ‘𝑥)
< (((log‘2) · 2) · 𝑥))) |
| 69 | 65, 68 | mpbird 247 |
. . . . . 6
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
((θ‘𝑥) / 𝑥) < ((log‘2) ·
2)) |
| 70 | 25, 26, 69 | ltled 10185 |
. . . . 5
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
((θ‘𝑥) / 𝑥) ≤ ((log‘2) ·
2)) |
| 71 | 24, 70 | eqbrtrd 4675 |
. . . 4
⊢ ((𝑥 ∈ ℝ+
∧ 3 ≤ 𝑥) →
(abs‘((θ‘𝑥) / 𝑥)) ≤ ((log‘2) ·
2)) |
| 72 | 71 | adantl 482 |
. . 3
⊢
((⊤ ∧ (𝑥
∈ ℝ+ ∧ 3 ≤ 𝑥)) → (abs‘((θ‘𝑥) / 𝑥)) ≤ ((log‘2) ·
2)) |
| 73 | 2, 9, 11, 17, 72 | elo1d 14267 |
. 2
⊢ (⊤
→ (𝑥 ∈
ℝ+ ↦ ((θ‘𝑥) / 𝑥)) ∈ 𝑂(1)) |
| 74 | 73 | trud 1493 |
1
⊢ (𝑥 ∈ ℝ+
↦ ((θ‘𝑥)
/ 𝑥)) ∈
𝑂(1) |