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Description: The psi function is upper bounded by a linear term. (Contributed by Mario Carneiro, 16-Apr-2016)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | chpo1ub | ⊢ ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ∈ 𝑂(1) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 2re | ⊢ 2 ∈ ℝ | |
| 2 | elicopnf | ⊢ ( 2 ∈ ℝ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↔ ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) ) ) | |
| 3 | 1 2 | ax-mp | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↔ ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) ) |
| 4 | chtrpcl | ⊢ ( ( 𝑥 ∈ ℝ ∧ 2 ≤ 𝑥 ) → ( θ ‘ 𝑥 ) ∈ ℝ+ ) | |
| 5 | 3 4 | sylbi | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( θ ‘ 𝑥 ) ∈ ℝ+ ) |
| 6 | 5 | rpcnne0d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( θ ‘ 𝑥 ) ∈ ℂ ∧ ( θ ‘ 𝑥 ) ≠ 0 ) ) |
| 7 | 3 | simplbi | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 𝑥 ∈ ℝ ) |
| 8 | 0red | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 ∈ ℝ ) | |
| 9 | 1 | a1i | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 2 ∈ ℝ ) |
| 10 | 2pos | ⊢ 0 < 2 | |
| 11 | 10 | a1i | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 < 2 ) |
| 12 | 3 | simprbi | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 2 ≤ 𝑥 ) |
| 13 | 8 9 7 11 12 | ltletrd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 0 < 𝑥 ) |
| 14 | 7 13 | elrpd | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → 𝑥 ∈ ℝ+ ) |
| 15 | 14 | rpcnne0d | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ) |
| 16 | rpre | ⊢ ( 𝑥 ∈ ℝ+ → 𝑥 ∈ ℝ ) | |
| 17 | chpcl | ⊢ ( 𝑥 ∈ ℝ → ( ψ ‘ 𝑥 ) ∈ ℝ ) | |
| 18 | 16 17 | syl | ⊢ ( 𝑥 ∈ ℝ+ → ( ψ ‘ 𝑥 ) ∈ ℝ ) |
| 19 | 18 | recnd | ⊢ ( 𝑥 ∈ ℝ+ → ( ψ ‘ 𝑥 ) ∈ ℂ ) |
| 20 | 14 19 | syl | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ψ ‘ 𝑥 ) ∈ ℂ ) |
| 21 | dmdcan | ⊢ ( ( ( ( θ ‘ 𝑥 ) ∈ ℂ ∧ ( θ ‘ 𝑥 ) ≠ 0 ) ∧ ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ∧ ( ψ ‘ 𝑥 ) ∈ ℂ ) → ( ( ( θ ‘ 𝑥 ) / 𝑥 ) · ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) = ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) | |
| 22 | 6 15 20 21 | syl3anc | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) → ( ( ( θ ‘ 𝑥 ) / 𝑥 ) · ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) = ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) |
| 23 | 22 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ( θ ‘ 𝑥 ) / 𝑥 ) · ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) = ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) |
| 24 | 23 | mpteq2dva | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ( θ ‘ 𝑥 ) / 𝑥 ) · ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ) |
| 25 | ovexd | ⊢ ( ⊤ → ( 2 [,) +∞ ) ∈ V ) | |
| 26 | ovexd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( θ ‘ 𝑥 ) / 𝑥 ) ∈ V ) | |
| 27 | ovexd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ( 2 [,) +∞ ) ) → ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ∈ V ) | |
| 28 | eqidd | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ) | |
| 29 | eqidd | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ) | |
| 30 | 25 26 27 28 29 | offval2 | ⊢ ( ⊤ → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ( θ ‘ 𝑥 ) / 𝑥 ) · ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ) ) |
| 31 | 14 | ssriv | ⊢ ( 2 [,) +∞ ) ⊆ ℝ+ |
| 32 | resmpt | ⊢ ( ( 2 [,) +∞ ) ⊆ ℝ+ → ( ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ↾ ( 2 [,) +∞ ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ) | |
| 33 | 31 32 | mp1i | ⊢ ( ⊤ → ( ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ↾ ( 2 [,) +∞ ) ) = ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ) |
| 34 | 24 30 33 | 3eqtr4rd | ⊢ ( ⊤ → ( ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ↾ ( 2 [,) +∞ ) ) = ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ) ) |
| 35 | 31 | a1i | ⊢ ( ⊤ → ( 2 [,) +∞ ) ⊆ ℝ+ ) |
| 36 | chto1ub | ⊢ ( 𝑥 ∈ ℝ+ ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ∈ 𝑂(1) | |
| 37 | 36 | a1i | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ∈ 𝑂(1) ) |
| 38 | 35 37 | o1res2 | ⊢ ( ⊤ → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ∈ 𝑂(1) ) |
| 39 | chpchtlim | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ⇝𝑟 1 | |
| 40 | rlimo1 | ⊢ ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ⇝𝑟 1 → ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ∈ 𝑂(1) ) | |
| 41 | 39 40 | ax-mp | ⊢ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ∈ 𝑂(1) |
| 42 | o1mul | ⊢ ( ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ∈ 𝑂(1) ∧ ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ∈ 𝑂(1) ) → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ) ∈ 𝑂(1) ) | |
| 43 | 38 41 42 | sylancl | ⊢ ( ⊤ → ( ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( θ ‘ 𝑥 ) / 𝑥 ) ) ∘f · ( 𝑥 ∈ ( 2 [,) +∞ ) ↦ ( ( ψ ‘ 𝑥 ) / ( θ ‘ 𝑥 ) ) ) ) ∈ 𝑂(1) ) |
| 44 | 34 43 | eqeltrd | ⊢ ( ⊤ → ( ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ↾ ( 2 [,) +∞ ) ) ∈ 𝑂(1) ) |
| 45 | rerpdivcl | ⊢ ( ( ( ψ ‘ 𝑥 ) ∈ ℝ ∧ 𝑥 ∈ ℝ+ ) → ( ( ψ ‘ 𝑥 ) / 𝑥 ) ∈ ℝ ) | |
| 46 | 18 45 | mpancom | ⊢ ( 𝑥 ∈ ℝ+ → ( ( ψ ‘ 𝑥 ) / 𝑥 ) ∈ ℝ ) |
| 47 | 46 | recnd | ⊢ ( 𝑥 ∈ ℝ+ → ( ( ψ ‘ 𝑥 ) / 𝑥 ) ∈ ℂ ) |
| 48 | 47 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( ψ ‘ 𝑥 ) / 𝑥 ) ∈ ℂ ) |
| 49 | 48 | fmpttd | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) : ℝ+ ⟶ ℂ ) |
| 50 | rpssre | ⊢ ℝ+ ⊆ ℝ | |
| 51 | 50 | a1i | ⊢ ( ⊤ → ℝ+ ⊆ ℝ ) |
| 52 | 1 | a1i | ⊢ ( ⊤ → 2 ∈ ℝ ) |
| 53 | 49 51 52 | o1resb | ⊢ ( ⊤ → ( ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ∈ 𝑂(1) ↔ ( ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ↾ ( 2 [,) +∞ ) ) ∈ 𝑂(1) ) ) |
| 54 | 44 53 | mpbird | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ∈ 𝑂(1) ) |
| 55 | 54 | mptru | ⊢ ( 𝑥 ∈ ℝ+ ↦ ( ( ψ ‘ 𝑥 ) / 𝑥 ) ) ∈ 𝑂(1) |