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Description: Any power grows slower than any exponential with base greater than 1 . (Contributed by Mario Carneiro, 18-Sep-2014)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | cxp2lim | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ⇝𝑟 0 ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1re | ⊢ 1 ∈ ℝ | |
| 2 | elicopnf | ⊢ ( 1 ∈ ℝ → ( 𝑛 ∈ ( 1 [,) +∞ ) ↔ ( 𝑛 ∈ ℝ ∧ 1 ≤ 𝑛 ) ) ) | |
| 3 | 1 2 | ax-mp | ⊢ ( 𝑛 ∈ ( 1 [,) +∞ ) ↔ ( 𝑛 ∈ ℝ ∧ 1 ≤ 𝑛 ) ) |
| 4 | 3 | simplbi | ⊢ ( 𝑛 ∈ ( 1 [,) +∞ ) → 𝑛 ∈ ℝ ) |
| 5 | 0red | ⊢ ( 𝑛 ∈ ( 1 [,) +∞ ) → 0 ∈ ℝ ) | |
| 6 | 1red | ⊢ ( 𝑛 ∈ ( 1 [,) +∞ ) → 1 ∈ ℝ ) | |
| 7 | 0lt1 | ⊢ 0 < 1 | |
| 8 | 7 | a1i | ⊢ ( 𝑛 ∈ ( 1 [,) +∞ ) → 0 < 1 ) |
| 9 | 3 | simprbi | ⊢ ( 𝑛 ∈ ( 1 [,) +∞ ) → 1 ≤ 𝑛 ) |
| 10 | 5 6 4 8 9 | ltletrd | ⊢ ( 𝑛 ∈ ( 1 [,) +∞ ) → 0 < 𝑛 ) |
| 11 | 4 10 | elrpd | ⊢ ( 𝑛 ∈ ( 1 [,) +∞ ) → 𝑛 ∈ ℝ+ ) |
| 12 | 11 | ssriv | ⊢ ( 1 [,) +∞ ) ⊆ ℝ+ |
| 13 | resmpt | ⊢ ( ( 1 [,) +∞ ) ⊆ ℝ+ → ( ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ↾ ( 1 [,) +∞ ) ) = ( 𝑛 ∈ ( 1 [,) +∞ ) ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ) | |
| 14 | 12 13 | ax-mp | ⊢ ( ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ↾ ( 1 [,) +∞ ) ) = ( 𝑛 ∈ ( 1 [,) +∞ ) ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) |
| 15 | 0red | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 0 ∈ ℝ ) | |
| 16 | 12 | a1i | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 1 [,) +∞ ) ⊆ ℝ+ ) |
| 17 | rpre | ⊢ ( 𝑛 ∈ ℝ+ → 𝑛 ∈ ℝ ) | |
| 18 | 17 | adantl | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 𝑛 ∈ ℝ ) |
| 19 | rpge0 | ⊢ ( 𝑛 ∈ ℝ+ → 0 ≤ 𝑛 ) | |
| 20 | 19 | adantl | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 0 ≤ 𝑛 ) |
| 21 | simpl2 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 𝐵 ∈ ℝ ) | |
| 22 | 0red | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 0 ∈ ℝ ) | |
| 23 | 1red | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 1 ∈ ℝ ) | |
| 24 | 7 | a1i | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 0 < 1 ) |
| 25 | simpl3 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 1 < 𝐵 ) | |
| 26 | 22 23 21 24 25 | lttrd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 0 < 𝐵 ) |
| 27 | 21 26 | elrpd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 𝐵 ∈ ℝ+ ) |
| 28 | 27 18 | rpcxpcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝐵 ↑𝑐 𝑛 ) ∈ ℝ+ ) |
| 29 | simp1 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 𝐴 ∈ ℝ ) | |
| 30 | ifcl | ⊢ ( ( 𝐴 ∈ ℝ ∧ 1 ∈ ℝ ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ∈ ℝ ) | |
| 31 | 29 1 30 | sylancl | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ∈ ℝ ) |
| 32 | 1red | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 1 ∈ ℝ ) | |
| 33 | 7 | a1i | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 0 < 1 ) |
| 34 | max1 | ⊢ ( ( 1 ∈ ℝ ∧ 𝐴 ∈ ℝ ) → 1 ≤ if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) | |
| 35 | 1 29 34 | sylancr | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 1 ≤ if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) |
| 36 | 15 32 31 33 35 | ltletrd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 0 < if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) |
| 37 | 31 36 | elrpd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ∈ ℝ+ ) |
| 38 | 37 | rprecred | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ∈ ℝ ) |
| 39 | 38 | adantr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ∈ ℝ ) |
| 40 | 28 39 | rpcxpcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ∈ ℝ+ ) |
| 41 | 31 | recnd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ∈ ℂ ) |
| 42 | 41 | adantr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ∈ ℂ ) |
| 43 | 18 20 40 42 | divcxpd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝑛 / ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) = ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) |
| 44 | 37 | adantr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ∈ ℝ+ ) |
| 45 | 44 | rpne0d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ≠ 0 ) |
| 46 | 42 45 | recid2d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) · if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) = 1 ) |
| 47 | 46 | oveq2d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) · if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) = ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 1 ) ) |
| 48 | 28 39 42 | cxpmuld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) · if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) = ( ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) |
| 49 | 28 | rpcnd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝐵 ↑𝑐 𝑛 ) ∈ ℂ ) |
| 50 | 49 | cxp1d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 1 ) = ( 𝐵 ↑𝑐 𝑛 ) ) |
| 51 | 47 48 50 | 3eqtr3d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) = ( 𝐵 ↑𝑐 𝑛 ) ) |
| 52 | 51 | oveq2d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) = ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) |
| 53 | 43 52 | eqtrd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝑛 / ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) = ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) |
| 54 | 53 | mpteq2dva | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 / ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) = ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ) |
| 55 | ovexd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝑛 / ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) ∈ V ) | |
| 56 | 18 | recnd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 𝑛 ∈ ℂ ) |
| 57 | 38 | recnd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ∈ ℂ ) |
| 58 | 57 | adantr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ∈ ℂ ) |
| 59 | 56 58 | mulcomd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝑛 · ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) = ( ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) · 𝑛 ) ) |
| 60 | 59 | oveq2d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝐵 ↑𝑐 ( 𝑛 · ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) = ( 𝐵 ↑𝑐 ( ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) · 𝑛 ) ) ) |
| 61 | 27 18 58 | cxpmuld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝐵 ↑𝑐 ( 𝑛 · ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) = ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) |
| 62 | 27 39 56 | cxpmuld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝐵 ↑𝑐 ( ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) · 𝑛 ) ) = ( ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 𝑛 ) ) |
| 63 | 60 61 62 | 3eqtr3d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) = ( ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 𝑛 ) ) |
| 64 | 63 | oveq2d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝑛 / ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) = ( 𝑛 / ( ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 𝑛 ) ) ) |
| 65 | 64 | mpteq2dva | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( 𝑛 / ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) ) = ( 𝑛 ∈ ℝ+ ↦ ( 𝑛 / ( ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 𝑛 ) ) ) ) |
| 66 | simp2 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 𝐵 ∈ ℝ ) | |
| 67 | simp3 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 1 < 𝐵 ) | |
| 68 | 15 32 66 33 67 | lttrd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 0 < 𝐵 ) |
| 69 | 66 68 | elrpd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 𝐵 ∈ ℝ+ ) |
| 70 | 69 38 | rpcxpcld | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ∈ ℝ+ ) |
| 71 | 70 | rpred | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ∈ ℝ ) |
| 72 | 57 | 1cxpd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 1 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) = 1 ) |
| 73 | 0le1 | ⊢ 0 ≤ 1 | |
| 74 | 73 | a1i | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 0 ≤ 1 ) |
| 75 | 69 | rpge0d | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 0 ≤ 𝐵 ) |
| 76 | 37 | rpreccld | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ∈ ℝ+ ) |
| 77 | 32 74 66 75 76 | cxplt2d | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 1 < 𝐵 ↔ ( 1 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) < ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) ) |
| 78 | 67 77 | mpbid | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 1 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) < ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) |
| 79 | 72 78 | eqbrtrrd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → 1 < ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) |
| 80 | cxp2limlem | ⊢ ( ( ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ∈ ℝ ∧ 1 < ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) → ( 𝑛 ∈ ℝ+ ↦ ( 𝑛 / ( ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 𝑛 ) ) ) ⇝𝑟 0 ) | |
| 81 | 71 79 80 | syl2anc | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( 𝑛 / ( ( 𝐵 ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ↑𝑐 𝑛 ) ) ) ⇝𝑟 0 ) |
| 82 | 65 81 | eqbrtrd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( 𝑛 / ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) ) ⇝𝑟 0 ) |
| 83 | 55 82 37 | rlimcxp | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 / ( ( 𝐵 ↑𝑐 𝑛 ) ↑𝑐 ( 1 / if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ) ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) ⇝𝑟 0 ) |
| 84 | 54 83 | eqbrtrrd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ⇝𝑟 0 ) |
| 85 | 16 84 | rlimres2 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ( 1 [,) +∞ ) ↦ ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ⇝𝑟 0 ) |
| 86 | simpr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 𝑛 ∈ ℝ+ ) | |
| 87 | 31 | adantr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ∈ ℝ ) |
| 88 | 86 87 | rpcxpcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ∈ ℝ+ ) |
| 89 | 88 28 | rpdivcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ∈ ℝ+ ) |
| 90 | 89 | rpred | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ∈ ℝ ) |
| 91 | 11 90 | sylan2 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ∈ ℝ ) |
| 92 | simpl1 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → 𝐴 ∈ ℝ ) | |
| 93 | 86 92 | rpcxpcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( 𝑛 ↑𝑐 𝐴 ) ∈ ℝ+ ) |
| 94 | 93 28 | rpdivcld | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ∈ ℝ+ ) |
| 95 | 11 94 | sylan2 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ∈ ℝ+ ) |
| 96 | 95 | rpred | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ∈ ℝ ) |
| 97 | 11 93 | sylan2 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( 𝑛 ↑𝑐 𝐴 ) ∈ ℝ+ ) |
| 98 | 97 | rpred | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( 𝑛 ↑𝑐 𝐴 ) ∈ ℝ ) |
| 99 | 11 88 | sylan2 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ∈ ℝ+ ) |
| 100 | 99 | rpred | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ∈ ℝ ) |
| 101 | 11 28 | sylan2 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( 𝐵 ↑𝑐 𝑛 ) ∈ ℝ+ ) |
| 102 | 4 | adantl | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → 𝑛 ∈ ℝ ) |
| 103 | 9 | adantl | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → 1 ≤ 𝑛 ) |
| 104 | simpl1 | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → 𝐴 ∈ ℝ ) | |
| 105 | 31 | adantr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ∈ ℝ ) |
| 106 | max2 | ⊢ ( ( 1 ∈ ℝ ∧ 𝐴 ∈ ℝ ) → 𝐴 ≤ if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) | |
| 107 | 1 104 106 | sylancr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → 𝐴 ≤ if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) |
| 108 | 102 103 104 105 107 | cxplead | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( 𝑛 ↑𝑐 𝐴 ) ≤ ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) ) |
| 109 | 98 100 101 108 | lediv1dd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ≤ ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) |
| 110 | 109 | adantrr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ ( 𝑛 ∈ ( 1 [,) +∞ ) ∧ 0 ≤ 𝑛 ) ) → ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ≤ ( ( 𝑛 ↑𝑐 if ( 1 ≤ 𝐴 , 𝐴 , 1 ) ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) |
| 111 | 95 | rpge0d | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ( 1 [,) +∞ ) ) → 0 ≤ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) |
| 112 | 111 | adantrr | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ ( 𝑛 ∈ ( 1 [,) +∞ ) ∧ 0 ≤ 𝑛 ) ) → 0 ≤ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) |
| 113 | 15 15 85 91 96 110 112 | rlimsqz2 | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ( 1 [,) +∞ ) ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ⇝𝑟 0 ) |
| 114 | 14 113 | eqbrtrid | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ↾ ( 1 [,) +∞ ) ) ⇝𝑟 0 ) |
| 115 | 94 | rpcnd | ⊢ ( ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) ∧ 𝑛 ∈ ℝ+ ) → ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ∈ ℂ ) |
| 116 | 115 | fmpttd | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) : ℝ+ ⟶ ℂ ) |
| 117 | rpssre | ⊢ ℝ+ ⊆ ℝ | |
| 118 | 117 | a1i | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ℝ+ ⊆ ℝ ) |
| 119 | 116 118 32 | rlimresb | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ⇝𝑟 0 ↔ ( ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ↾ ( 1 [,) +∞ ) ) ⇝𝑟 0 ) ) |
| 120 | 114 119 | mpbird | ⊢ ( ( 𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 1 < 𝐵 ) → ( 𝑛 ∈ ℝ+ ↦ ( ( 𝑛 ↑𝑐 𝐴 ) / ( 𝐵 ↑𝑐 𝑛 ) ) ) ⇝𝑟 0 ) |