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Description: Combine the estimates logfacubnd and logfaclbnd , to get log ( x ! ) = x log x + O ( x ) . Equation 9.2.9 of Shapiro, p. 329. This is a weak form of the even stronger statement, log ( x ! ) = x log x - x + O ( log x ) . (Contributed by Mario Carneiro, 16-Apr-2016) (Revised by Mario Carneiro, 21-May-2016)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | logfacrlim | ⊢ ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) ) ⇝𝑟 1 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1red | ⊢ ( ⊤ → 1 ∈ ℝ ) | |
| 2 | 1cnd | ⊢ ( ⊤ → 1 ∈ ℂ ) | |
| 3 | relogcl | ⊢ ( 𝑥 ∈ ℝ+ → ( log ‘ 𝑥 ) ∈ ℝ ) | |
| 4 | 3 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( log ‘ 𝑥 ) ∈ ℝ ) |
| 5 | 4 | recnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( log ‘ 𝑥 ) ∈ ℂ ) |
| 6 | 1cnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → 1 ∈ ℂ ) | |
| 7 | rpcnne0 | ⊢ ( 𝑥 ∈ ℝ+ → ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ) | |
| 8 | 7 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ) |
| 9 | divdir | ⊢ ( ( ( log ‘ 𝑥 ) ∈ ℂ ∧ 1 ∈ ℂ ∧ ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ) → ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) = ( ( ( log ‘ 𝑥 ) / 𝑥 ) + ( 1 / 𝑥 ) ) ) | |
| 10 | 5 6 8 9 | syl3anc | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) = ( ( ( log ‘ 𝑥 ) / 𝑥 ) + ( 1 / 𝑥 ) ) ) |
| 11 | 10 | mpteq2dva | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) = ( 𝑥 ∈ ℝ+ ↦ ( ( ( log ‘ 𝑥 ) / 𝑥 ) + ( 1 / 𝑥 ) ) ) ) |
| 12 | simpr | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → 𝑥 ∈ ℝ+ ) | |
| 13 | 4 12 | rerpdivcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( log ‘ 𝑥 ) / 𝑥 ) ∈ ℝ ) |
| 14 | rpreccl | ⊢ ( 𝑥 ∈ ℝ+ → ( 1 / 𝑥 ) ∈ ℝ+ ) | |
| 15 | 14 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( 1 / 𝑥 ) ∈ ℝ+ ) |
| 16 | 15 | rpred | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( 1 / 𝑥 ) ∈ ℝ ) |
| 17 | 8 | simpld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → 𝑥 ∈ ℂ ) |
| 18 | 17 | cxp1d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( 𝑥 ↑𝑐 1 ) = 𝑥 ) |
| 19 | 18 | oveq2d | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 1 ) ) = ( ( log ‘ 𝑥 ) / 𝑥 ) ) |
| 20 | 19 | mpteq2dva | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 1 ) ) ) = ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) / 𝑥 ) ) ) |
| 21 | 1rp | ⊢ 1 ∈ ℝ+ | |
| 22 | cxploglim | ⊢ ( 1 ∈ ℝ+ → ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 1 ) ) ) ⇝𝑟 0 ) | |
| 23 | 21 22 | mp1i | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) / ( 𝑥 ↑𝑐 1 ) ) ) ⇝𝑟 0 ) |
| 24 | 20 23 | eqbrtrrd | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) / 𝑥 ) ) ⇝𝑟 0 ) |
| 25 | ax-1cn | ⊢ 1 ∈ ℂ | |
| 26 | divrcnv | ⊢ ( 1 ∈ ℂ → ( 𝑥 ∈ ℝ+ ↦ ( 1 / 𝑥 ) ) ⇝𝑟 0 ) | |
| 27 | 25 26 | mp1i | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( 1 / 𝑥 ) ) ⇝𝑟 0 ) |
| 28 | 13 16 24 27 | rlimadd | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( ( log ‘ 𝑥 ) / 𝑥 ) + ( 1 / 𝑥 ) ) ) ⇝𝑟 ( 0 + 0 ) ) |
| 29 | 11 28 | eqbrtrd | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) ⇝𝑟 ( 0 + 0 ) ) |
| 30 | 00id | ⊢ ( 0 + 0 ) = 0 | |
| 31 | 29 30 | breqtrdi | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) ⇝𝑟 0 ) |
| 32 | peano2re | ⊢ ( ( log ‘ 𝑥 ) ∈ ℝ → ( ( log ‘ 𝑥 ) + 1 ) ∈ ℝ ) | |
| 33 | 4 32 | syl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( log ‘ 𝑥 ) + 1 ) ∈ ℝ ) |
| 34 | 33 12 | rerpdivcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ∈ ℝ ) |
| 35 | 34 | recnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ∈ ℂ ) |
| 36 | rprege0 | ⊢ ( 𝑥 ∈ ℝ+ → ( 𝑥 ∈ ℝ ∧ 0 ≤ 𝑥 ) ) | |
| 37 | 36 | adantl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( 𝑥 ∈ ℝ ∧ 0 ≤ 𝑥 ) ) |
| 38 | flge0nn0 | ⊢ ( ( 𝑥 ∈ ℝ ∧ 0 ≤ 𝑥 ) → ( ⌊ ‘ 𝑥 ) ∈ ℕ0 ) | |
| 39 | faccl | ⊢ ( ( ⌊ ‘ 𝑥 ) ∈ ℕ0 → ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ∈ ℕ ) | |
| 40 | 37 38 39 | 3syl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ∈ ℕ ) |
| 41 | 40 | nnrpd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ∈ ℝ+ ) |
| 42 | relogcl | ⊢ ( ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ∈ ℝ+ → ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ∈ ℝ ) | |
| 43 | 41 42 | syl | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ∈ ℝ ) |
| 44 | 43 12 | rerpdivcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ∈ ℝ ) |
| 45 | 44 | recnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ∈ ℂ ) |
| 46 | 5 45 | subcld | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) ∈ ℂ ) |
| 47 | logfacbnd3 | ⊢ ( ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) → ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) ≤ ( ( log ‘ 𝑥 ) + 1 ) ) | |
| 48 | 47 | adantl | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) ≤ ( ( log ‘ 𝑥 ) + 1 ) ) |
| 49 | 43 | recnd | ⊢ ( ( ⊤ ∧ 𝑥 ∈ ℝ+ ) → ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ∈ ℂ ) |
| 50 | 49 | adantrr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ∈ ℂ ) |
| 51 | 7 | ad2antrl | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ) |
| 52 | 51 | simpld | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → 𝑥 ∈ ℂ ) |
| 53 | 5 | adantrr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( log ‘ 𝑥 ) ∈ ℂ ) |
| 54 | subcl | ⊢ ( ( ( log ‘ 𝑥 ) ∈ ℂ ∧ 1 ∈ ℂ ) → ( ( log ‘ 𝑥 ) − 1 ) ∈ ℂ ) | |
| 55 | 53 25 54 | sylancl | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( log ‘ 𝑥 ) − 1 ) ∈ ℂ ) |
| 56 | 52 55 | mulcld | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ∈ ℂ ) |
| 57 | 50 56 | subcld | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ∈ ℂ ) |
| 58 | 57 | abscld | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) ∈ ℝ ) |
| 59 | 4 | adantrr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( log ‘ 𝑥 ) ∈ ℝ ) |
| 60 | 59 32 | syl | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( log ‘ 𝑥 ) + 1 ) ∈ ℝ ) |
| 61 | rpregt0 | ⊢ ( 𝑥 ∈ ℝ+ → ( 𝑥 ∈ ℝ ∧ 0 < 𝑥 ) ) | |
| 62 | 61 | ad2antrl | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( 𝑥 ∈ ℝ ∧ 0 < 𝑥 ) ) |
| 63 | lediv1 | ⊢ ( ( ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) ∈ ℝ ∧ ( ( log ‘ 𝑥 ) + 1 ) ∈ ℝ ∧ ( 𝑥 ∈ ℝ ∧ 0 < 𝑥 ) ) → ( ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) ≤ ( ( log ‘ 𝑥 ) + 1 ) ↔ ( ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) / 𝑥 ) ≤ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) ) | |
| 64 | 58 60 62 63 | syl3anc | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) ≤ ( ( log ‘ 𝑥 ) + 1 ) ↔ ( ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) / 𝑥 ) ≤ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) ) |
| 65 | 48 64 | mpbid | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) / 𝑥 ) ≤ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) |
| 66 | 51 | simprd | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → 𝑥 ≠ 0 ) |
| 67 | 55 52 66 | divcan3d | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) / 𝑥 ) = ( ( log ‘ 𝑥 ) − 1 ) ) |
| 68 | 67 | oveq1d | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) / 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) = ( ( ( log ‘ 𝑥 ) − 1 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) ) |
| 69 | divsubdir | ⊢ ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ∈ ℂ ∧ ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ∈ ℂ ∧ ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ) → ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) / 𝑥 ) = ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) / 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) ) | |
| 70 | 56 50 51 69 | syl3anc | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) / 𝑥 ) = ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) / 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) ) |
| 71 | 45 | adantrr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ∈ ℂ ) |
| 72 | 1cnd | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → 1 ∈ ℂ ) | |
| 73 | 53 71 72 | sub32d | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) − 1 ) = ( ( ( log ‘ 𝑥 ) − 1 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) ) |
| 74 | 68 70 73 | 3eqtr4rd | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) − 1 ) = ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) / 𝑥 ) ) |
| 75 | 74 | fveq2d | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) − 1 ) ) = ( abs ‘ ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) / 𝑥 ) ) ) |
| 76 | 56 50 | subcld | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) ∈ ℂ ) |
| 77 | 76 52 66 | absdivd | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) / 𝑥 ) ) = ( ( abs ‘ ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) ) / ( abs ‘ 𝑥 ) ) ) |
| 78 | 56 50 | abssubd | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) ) = ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) ) |
| 79 | 36 | ad2antrl | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( 𝑥 ∈ ℝ ∧ 0 ≤ 𝑥 ) ) |
| 80 | absid | ⊢ ( ( 𝑥 ∈ ℝ ∧ 0 ≤ 𝑥 ) → ( abs ‘ 𝑥 ) = 𝑥 ) | |
| 81 | 79 80 | syl | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ 𝑥 ) = 𝑥 ) |
| 82 | 78 81 | oveq12d | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( abs ‘ ( ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) − ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) ) ) / ( abs ‘ 𝑥 ) ) = ( ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) / 𝑥 ) ) |
| 83 | 75 77 82 | 3eqtrd | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) − 1 ) ) = ( ( abs ‘ ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) − ( 𝑥 · ( ( log ‘ 𝑥 ) − 1 ) ) ) ) / 𝑥 ) ) |
| 84 | 35 | adantrr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ∈ ℂ ) |
| 85 | 84 | subid1d | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) − 0 ) = ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) |
| 86 | 85 | fveq2d | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) − 0 ) ) = ( abs ‘ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) ) |
| 87 | log1 | ⊢ ( log ‘ 1 ) = 0 | |
| 88 | simprr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → 1 ≤ 𝑥 ) | |
| 89 | 12 | adantrr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → 𝑥 ∈ ℝ+ ) |
| 90 | logleb | ⊢ ( ( 1 ∈ ℝ+ ∧ 𝑥 ∈ ℝ+ ) → ( 1 ≤ 𝑥 ↔ ( log ‘ 1 ) ≤ ( log ‘ 𝑥 ) ) ) | |
| 91 | 21 89 90 | sylancr | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( 1 ≤ 𝑥 ↔ ( log ‘ 1 ) ≤ ( log ‘ 𝑥 ) ) ) |
| 92 | 88 91 | mpbid | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( log ‘ 1 ) ≤ ( log ‘ 𝑥 ) ) |
| 93 | 87 92 | eqbrtrrid | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → 0 ≤ ( log ‘ 𝑥 ) ) |
| 94 | 59 93 | ge0p1rpd | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( log ‘ 𝑥 ) + 1 ) ∈ ℝ+ ) |
| 95 | 94 89 | rpdivcld | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ∈ ℝ+ ) |
| 96 | rprege0 | ⊢ ( ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ∈ ℝ+ → ( ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ∈ ℝ ∧ 0 ≤ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) ) | |
| 97 | absid | ⊢ ( ( ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ∈ ℝ ∧ 0 ≤ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) → ( abs ‘ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) = ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) | |
| 98 | 95 96 97 | 3syl | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) = ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) |
| 99 | 86 98 | eqtrd | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) − 0 ) ) = ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) ) |
| 100 | 65 83 99 | 3brtr4d | ⊢ ( ( ⊤ ∧ ( 𝑥 ∈ ℝ+ ∧ 1 ≤ 𝑥 ) ) → ( abs ‘ ( ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) − 1 ) ) ≤ ( abs ‘ ( ( ( ( log ‘ 𝑥 ) + 1 ) / 𝑥 ) − 0 ) ) ) |
| 101 | 1 2 31 35 46 100 | rlimsqzlem | ⊢ ( ⊤ → ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) ) ⇝𝑟 1 ) |
| 102 | 101 | mptru | ⊢ ( 𝑥 ∈ ℝ+ ↦ ( ( log ‘ 𝑥 ) − ( ( log ‘ ( ! ‘ ( ⌊ ‘ 𝑥 ) ) ) / 𝑥 ) ) ) ⇝𝑟 1 |