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Description: The psi and theta functions are asymptotic to each other, so is sufficient to prove either theta ( x ) / x ~>r 1 or psi ( x ) / x ~>r 1 to establish the PNT. (Contributed by Mario Carneiro, 8-Apr-2016)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | chpchtlim | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ⇝𝑟 1 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1red | ⊢ ( ⊤ → 1 ∈ ℝ ) | |
| 2 | 1red | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 1 ∈ ℝ ) | |
| 3 | 2re | ⊢ 2 ∈ ℝ | |
| 4 | elicopnf | ⊢ ( 2 ∈ ℝ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↔ ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) ) ) | |
| 5 | 3 4 | ax-mp | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↔ ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) ) |
| 6 | 5 | simplbi | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 𝑥 ∈ ℝ ) |
| 7 | 6 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 𝑥 ∈ ℝ ) |
| 8 | 0red | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 ∈ ℝ ) | |
| 9 | 3 | a1i | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 2 ∈ ℝ ) |
| 10 | 2pos | ⊢ 0 < 2 | |
| 11 | 10 | a1i | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 < 2 ) |
| 12 | 5 | simprbi | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 2 ≤ 𝑥 ) |
| 13 | 8 9 6 11 12 | ltletrd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 < 𝑥 ) |
| 14 | 6 13 | elrpd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 𝑥 ∈ ℝ+ ) |
| 15 | 14 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 𝑥 ∈ ℝ+ ) |
| 16 | 15 | rpge0d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 0 ≤ 𝑥 ) |
| 17 | 7 16 | resqrtcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( √ ‘ 𝑥 ) ∈ ℝ ) |
| 18 | 15 | relogcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( log ‘ 𝑥 ) ∈ ℝ ) |
| 19 | 17 18 | remulcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ∈ ℝ ) |
| 20 | 12 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 2 ≤ 𝑥 ) |
| 21 | chtrpcl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) → ( θ ‘ 𝑥 ) ∈ ℝ+ ) | |
| 22 | 7 20 21 | syl2anc | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( θ ‘ 𝑥 ) ∈ ℝ+ ) |
| 23 | 19 22 | rerpdivcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ∈ ℝ ) |
| 24 | 6 | ssriv | ⊢ ( 2 [,) +∞ ) ⊆ ℝ |
| 25 | 1 | recnd | ⊢ ( ⊤ → 1 ∈ ℂ ) |
| 26 | rlimconst | ⊢ ( ( ( 2 [,) +∞ ) ⊆ ℝ ∧ 1 ∈ ℂ ) → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ 1 ) ⇝𝑟 1 ) | |
| 27 | 24 25 26 | sylancr | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ 1 ) ⇝𝑟 1 ) |
| 28 | ovexd | ⊢ ( ⊤ → ( 2 [,) +∞ ) ∈ V ) | |
| 29 | 7 22 | rerpdivcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( 𝑥 / ( θ ‘ 𝑥 ) ) ∈ ℝ ) |
| 30 | ovexd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / 𝑥 ) ∈ V ) | |
| 31 | eqidd | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ) | |
| 32 | 7 | recnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 𝑥 ∈ ℂ ) |
| 33 | cxpsqrt | ⊢ ( 𝑥 ∈ ℂ → ( 𝑥 ↑𝑐 ( 1 / 2 ) ) = ( √ ‘ 𝑥 ) ) | |
| 34 | 32 33 | syl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( 𝑥 ↑𝑐 ( 1 / 2 ) ) = ( √ ‘ 𝑥 ) ) |
| 35 | 34 | oveq2d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) = ( ( log ‘ 𝑥 ) / ( √ ‘ 𝑥 ) ) ) |
| 36 | 18 | recnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( log ‘ 𝑥 ) ∈ ℂ ) |
| 37 | 15 | rpsqrtcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( √ ‘ 𝑥 ) ∈ ℝ+ ) |
| 38 | 37 | rpcnne0d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( √ ‘ 𝑥 ) ∈ ℂ ∧ ( √ ‘ 𝑥 ) ≠ 0 ) ) |
| 39 | divcan5 | ⊢ ( ( ( log ‘ 𝑥 ) ∈ ℂ ∧ ( ( √ ‘ 𝑥 ) ∈ ℂ ∧ ( √ ‘ 𝑥 ) ≠ 0 ) ∧ ( ( √ ‘ 𝑥 ) ∈ ℂ ∧ ( √ ‘ 𝑥 ) ≠ 0 ) ) → ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( ( √ ‘ 𝑥 ) · ( √ ‘ 𝑥 ) ) ) = ( ( log ‘ 𝑥 ) / ( √ ‘ 𝑥 ) ) ) | |
| 40 | 36 38 38 39 | syl3anc | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( ( √ ‘ 𝑥 ) · ( √ ‘ 𝑥 ) ) ) = ( ( log ‘ 𝑥 ) / ( √ ‘ 𝑥 ) ) ) |
| 41 | remsqsqrt | ⊢ ( ( 𝑥 ∈ ℝ ∧ 0 ≤ 𝑥 ) → ( ( √ ‘ 𝑥 ) · ( √ ‘ 𝑥 ) ) = 𝑥 ) | |
| 42 | 7 16 41 | syl2anc | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( √ ‘ 𝑥 ) · ( √ ‘ 𝑥 ) ) = 𝑥 ) |
| 43 | 42 | oveq2d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( ( √ ‘ 𝑥 ) · ( √ ‘ 𝑥 ) ) ) = ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / 𝑥 ) ) |
| 44 | 35 40 43 | 3eqtr2d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) = ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / 𝑥 ) ) |
| 45 | 44 | mpteq2dva | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / 𝑥 ) ) ) |
| 46 | 28 29 30 31 45 | offval2 | ⊢ ( ⊤ → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( θ ‘ 𝑥 ) ) · ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / 𝑥 ) ) ) ) |
| 47 | 15 | rpne0d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 𝑥 ≠ 0 ) |
| 48 | 22 | rpcnne0d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( θ ‘ 𝑥 ) ∈ ℂ ∧ ( θ ‘ 𝑥 ) ≠ 0 ) ) |
| 49 | 19 | recnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ∈ ℂ ) |
| 50 | dmdcan | ⊢ ( ( ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ∧ ( ( θ ‘ 𝑥 ) ∈ ℂ ∧ ( θ ‘ 𝑥 ) ≠ 0 ) ∧ ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ∈ ℂ ) → ( ( 𝑥 / ( θ ‘ 𝑥 ) ) · ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / 𝑥 ) ) = ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) | |
| 51 | 32 47 48 49 50 | syl211anc | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( 𝑥 / ( θ ‘ 𝑥 ) ) · ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / 𝑥 ) ) = ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) |
| 52 | 51 | mpteq2dva | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( 𝑥 / ( θ ‘ 𝑥 ) ) · ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / 𝑥 ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) |
| 53 | 46 52 | eqtrd | ⊢ ( ⊤ → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) |
| 54 | chto1lb | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∈ 𝑂(1) | |
| 55 | 14 | ssriv | ⊢ ( 2 [,) +∞ ) ⊆ ℝ+ |
| 56 | 55 | a1i | ⊢ ( ⊤ → ( 2 [,) +∞ ) ⊆ ℝ+ ) |
| 57 | 1rp | ⊢ 1 ∈ ℝ+ | |
| 58 | rphalfcl | ⊢ ( 1 ∈ ℝ+ → ( 1 / 2 ) ∈ ℝ+ ) | |
| 59 | 57 58 | ax-mp | ⊢ ( 1 / 2 ) ∈ ℝ+ |
| 60 | cxploglim | ⊢ ( ( 1 / 2 ) ∈ ℝ+ → ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ⇝𝑟 0 ) | |
| 61 | 59 60 | ax-mp | ⊢ ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ⇝𝑟 0 |
| 62 | 61 | a1i | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ⇝𝑟 0 ) |
| 63 | 56 62 | rlimres2 | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ⇝𝑟 0 ) |
| 64 | o1rlimmul | ⊢ ( ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∈ 𝑂(1) ∧ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ⇝𝑟 0 ) → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ) ⇝𝑟 0 ) | |
| 65 | 54 63 64 | sylancr | ⊢ ( ⊤ → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 𝑥 / ( θ ‘ 𝑥 ) ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 ( 1 / 2 ) ) ) ) ) ⇝𝑟 0 ) |
| 66 | 53 65 | eqbrtrrd | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ⇝𝑟 0 ) |
| 67 | 2 23 27 66 | rlimadd | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) ⇝𝑟 ( 1 + 0 ) ) |
| 68 | 1p0e1 | ⊢ ( 1 + 0 ) = 1 | |
| 69 | 67 68 | breqtrdi | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( 1 + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) ⇝𝑟 1 ) |
| 70 | 1re | ⊢ 1 ∈ ℝ | |
| 71 | readdcl | ⊢ ( ( 1 ∈ ℝ ∧ ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ∈ ℝ ) → ( 1 + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ∈ ℝ ) | |
| 72 | 70 23 71 | sylancr | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( 1 + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ∈ ℝ ) |
| 73 | chpcl | ⊢ ( 𝑥 ∈ ℝ → ( ψ ‘ 𝑥 ) ∈ ℝ ) | |
| 74 | 7 73 | syl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ψ ‘ 𝑥 ) ∈ ℝ ) |
| 75 | 74 22 | rerpdivcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ∈ ℝ ) |
| 76 | chtcl | ⊢ ( 𝑥 ∈ ℝ → ( θ ‘ 𝑥 ) ∈ ℝ ) | |
| 77 | 7 76 | syl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( θ ‘ 𝑥 ) ∈ ℝ ) |
| 78 | 77 19 | readdcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( θ ‘ 𝑥 ) + ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ∈ ℝ ) |
| 79 | 3 | a1i | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 2 ∈ ℝ ) |
| 80 | 1le2 | ⊢ 1 ≤ 2 | |
| 81 | 80 | a1i | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 1 ≤ 2 ) |
| 82 | 2 79 7 81 20 | letrd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 1 ≤ 𝑥 ) |
| 83 | chpub | ⊢ ( ( 𝑥 ∈ ℝ ∧ 1 ≤ 𝑥 ) → ( ψ ‘ 𝑥 ) ≤ ( ( θ ‘ 𝑥 ) + ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) | |
| 84 | 7 82 83 | syl2anc | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ψ ‘ 𝑥 ) ≤ ( ( θ ‘ 𝑥 ) + ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) ) |
| 85 | 74 78 22 84 | lediv1dd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ≤ ( ( ( θ ‘ 𝑥 ) + ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) / ( θ ‘ 𝑥 ) ) ) |
| 86 | 22 | rpcnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( θ ‘ 𝑥 ) ∈ ℂ ) |
| 87 | divdir | ⊢ ( ( ( θ ‘ 𝑥 ) ∈ ℂ ∧ ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ∈ ℂ ∧ ( ( θ ‘ 𝑥 ) ∈ ℂ ∧ ( θ ‘ 𝑥 ) ≠ 0 ) ) → ( ( ( θ ‘ 𝑥 ) + ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) / ( θ ‘ 𝑥 ) ) = ( ( ( θ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) | |
| 88 | 86 49 48 87 | syl3anc | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( θ ‘ 𝑥 ) + ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) / ( θ ‘ 𝑥 ) ) = ( ( ( θ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) |
| 89 | divid | ⊢ ( ( ( θ ‘ 𝑥 ) ∈ ℂ ∧ ( θ ‘ 𝑥 ) ≠ 0 ) → ( ( θ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) = 1 ) | |
| 90 | 48 89 | syl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( θ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) = 1 ) |
| 91 | 90 | oveq1d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( θ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) = ( 1 + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) |
| 92 | 88 91 | eqtrd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( θ ‘ 𝑥 ) + ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) ) / ( θ ‘ 𝑥 ) ) = ( 1 + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) |
| 93 | 85 92 | breqtrd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ≤ ( 1 + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) |
| 94 | 93 | adantrr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ( 2 [,) +∞ ) ∧ 1 ≤ 𝑥 ) ) → ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ≤ ( 1 + ( ( ( √ ‘ 𝑥 ) · ( log ‘ 𝑥 ) ) / ( θ ‘ 𝑥 ) ) ) ) |
| 95 | 86 | mullidd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( 1 · ( θ ‘ 𝑥 ) ) = ( θ ‘ 𝑥 ) ) |
| 96 | chtlepsi | ⊢ ( 𝑥 ∈ ℝ → ( θ ‘ 𝑥 ) ≤ ( ψ ‘ 𝑥 ) ) | |
| 97 | 7 96 | syl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( θ ‘ 𝑥 ) ≤ ( ψ ‘ 𝑥 ) ) |
| 98 | 95 97 | eqbrtrd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( 1 · ( θ ‘ 𝑥 ) ) ≤ ( ψ ‘ 𝑥 ) ) |
| 99 | 2 74 22 | lemuldivd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( 1 · ( θ ‘ 𝑥 ) ) ≤ ( ψ ‘ 𝑥 ) ↔ 1 ≤ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ) |
| 100 | 98 99 | mpbid | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → 1 ≤ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) |
| 101 | 100 | adantrr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ( 2 [,) +∞ ) ∧ 1 ≤ 𝑥 ) ) → 1 ≤ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) |
| 102 | 1 1 69 72 75 94 101 | rlimsqz2 | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ⇝𝑟 1 ) |
| 103 | 102 | mptru | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ⇝𝑟 1 |