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Description: The range of the given function. (Contributed by Glauco Siliprandi, 2-Jan-2022)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | limsup10exlem.1 | ⊢ 𝐹 = ( 𝑛 ∈ ℕ ↦ if ( 2 ∥ 𝑛 , 0 , 1 ) ) | |
| limsup10exlem.2 | ⊢ ( 𝜑 → 𝐾 ∈ ℝ ) | ||
| Assertion | limsup10exlem | ⊢ ( 𝜑 → ( 𝐹 “ ( 𝐾 [,) +∞ ) ) = { 0 , 1 } ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | limsup10exlem.1 | ⊢ 𝐹 = ( 𝑛 ∈ ℕ ↦ if ( 2 ∥ 𝑛 , 0 , 1 ) ) | |
| 2 | limsup10exlem.2 | ⊢ ( 𝜑 → 𝐾 ∈ ℝ ) | |
| 3 | c0ex | ⊢ 0 ∈ V | |
| 4 | 3 | prid1 | ⊢ 0 ∈ { 0 , 1 } |
| 5 | 1re | ⊢ 1 ∈ ℝ | |
| 6 | 5 | elexi | ⊢ 1 ∈ V |
| 7 | 6 | prid2 | ⊢ 1 ∈ { 0 , 1 } |
| 8 | 4 7 | ifcli | ⊢ if ( 2 ∥ 𝑛 , 0 , 1 ) ∈ { 0 , 1 } |
| 9 | 8 | a1i | ⊢ ( ( 𝜑 ∧ 𝑛 ∈ ( ℕ ∩ ( 𝐾 [,) +∞ ) ) ) → if ( 2 ∥ 𝑛 , 0 , 1 ) ∈ { 0 , 1 } ) |
| 10 | 9 | ralrimiva | ⊢ ( 𝜑 → ∀ 𝑛 ∈ ( ℕ ∩ ( 𝐾 [,) +∞ ) ) if ( 2 ∥ 𝑛 , 0 , 1 ) ∈ { 0 , 1 } ) |
| 11 | nfv | ⊢ Ⅎ 𝑛 𝜑 | |
| 12 | 3 6 | ifex | ⊢ if ( 2 ∥ 𝑛 , 0 , 1 ) ∈ V |
| 13 | 12 | a1i | ⊢ ( ( 𝜑 ∧ 𝑛 ∈ ( ℕ ∩ ( 𝐾 [,) +∞ ) ) ) → if ( 2 ∥ 𝑛 , 0 , 1 ) ∈ V ) |
| 14 | 11 13 1 | imassmpt | ⊢ ( 𝜑 → ( ( 𝐹 “ ( 𝐾 [,) +∞ ) ) ⊆ { 0 , 1 } ↔ ∀ 𝑛 ∈ ( ℕ ∩ ( 𝐾 [,) +∞ ) ) if ( 2 ∥ 𝑛 , 0 , 1 ) ∈ { 0 , 1 } ) ) |
| 15 | 10 14 | mpbird | ⊢ ( 𝜑 → ( 𝐹 “ ( 𝐾 [,) +∞ ) ) ⊆ { 0 , 1 } ) |
| 16 | 2 | ceilcld | ⊢ ( 𝜑 → ( ⌈ ‘ 𝐾 ) ∈ ℤ ) |
| 17 | 1zzd | ⊢ ( 𝜑 → 1 ∈ ℤ ) | |
| 18 | 16 17 | ifcld | ⊢ ( 𝜑 → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℤ ) |
| 19 | 18 | adantr | ⊢ ( ( 𝜑 ∧ 𝑛 = ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℤ ) |
| 20 | simpr | ⊢ ( ( 𝜑 ∧ 𝑛 = ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) → 𝑛 = ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) | |
| 21 | 2teven | ⊢ ( ( if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℤ ∧ 𝑛 = ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) → 2 ∥ 𝑛 ) | |
| 22 | 19 20 21 | syl2anc | ⊢ ( ( 𝜑 ∧ 𝑛 = ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) → 2 ∥ 𝑛 ) |
| 23 | 22 | iftrued | ⊢ ( ( 𝜑 ∧ 𝑛 = ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) → if ( 2 ∥ 𝑛 , 0 , 1 ) = 0 ) |
| 24 | 2nn | ⊢ 2 ∈ ℕ | |
| 25 | 24 | a1i | ⊢ ( 𝜑 → 2 ∈ ℕ ) |
| 26 | eqid | ⊢ ( ℤ≥ ‘ 1 ) = ( ℤ≥ ‘ 1 ) | |
| 27 | 5 | a1i | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → 1 ∈ ℝ ) |
| 28 | 2 | adantr | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → 𝐾 ∈ ℝ ) |
| 29 | 16 | zred | ⊢ ( 𝜑 → ( ⌈ ‘ 𝐾 ) ∈ ℝ ) |
| 30 | 29 | adantr | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → ( ⌈ ‘ 𝐾 ) ∈ ℝ ) |
| 31 | simpr | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → 1 ≤ 𝐾 ) | |
| 32 | 2 | ceilged | ⊢ ( 𝜑 → 𝐾 ≤ ( ⌈ ‘ 𝐾 ) ) |
| 33 | 32 | adantr | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → 𝐾 ≤ ( ⌈ ‘ 𝐾 ) ) |
| 34 | 27 28 30 31 33 | letrd | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → 1 ≤ ( ⌈ ‘ 𝐾 ) ) |
| 35 | iftrue | ⊢ ( 1 ≤ 𝐾 → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) = ( ⌈ ‘ 𝐾 ) ) | |
| 36 | 35 | adantl | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) = ( ⌈ ‘ 𝐾 ) ) |
| 37 | 34 36 | breqtrrd | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → 1 ≤ if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) |
| 38 | 5 | leidi | ⊢ 1 ≤ 1 |
| 39 | 38 | a1i | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → 1 ≤ 1 ) |
| 40 | iffalse | ⊢ ( ¬ 1 ≤ 𝐾 → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) = 1 ) | |
| 41 | 40 | adantl | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) = 1 ) |
| 42 | 39 41 | breqtrrd | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → 1 ≤ if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) |
| 43 | 37 42 | pm2.61dan | ⊢ ( 𝜑 → 1 ≤ if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) |
| 44 | 26 17 18 43 | eluzd | ⊢ ( 𝜑 → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ( ℤ≥ ‘ 1 ) ) |
| 45 | nnuz | ⊢ ℕ = ( ℤ≥ ‘ 1 ) | |
| 46 | 44 45 | eleqtrrdi | ⊢ ( 𝜑 → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℕ ) |
| 47 | 25 46 | nnmulcld | ⊢ ( 𝜑 → ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ∈ ℕ ) |
| 48 | 3 | a1i | ⊢ ( 𝜑 → 0 ∈ V ) |
| 49 | 1 23 47 48 | fvmptd2 | ⊢ ( 𝜑 → ( 𝐹 ‘ ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) = 0 ) |
| 50 | 12 1 | fnmpti | ⊢ 𝐹 Fn ℕ |
| 51 | 50 | a1i | ⊢ ( 𝜑 → 𝐹 Fn ℕ ) |
| 52 | 2 | rexrd | ⊢ ( 𝜑 → 𝐾 ∈ ℝ* ) |
| 53 | pnfxr | ⊢ +∞ ∈ ℝ* | |
| 54 | 53 | a1i | ⊢ ( 𝜑 → +∞ ∈ ℝ* ) |
| 55 | 47 | nnxrd | ⊢ ( 𝜑 → ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ∈ ℝ* ) |
| 56 | 47 | nnred | ⊢ ( 𝜑 → ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ∈ ℝ ) |
| 57 | 46 | nnred | ⊢ ( 𝜑 → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℝ ) |
| 58 | 33 36 | breqtrrd | ⊢ ( ( 𝜑 ∧ 1 ≤ 𝐾 ) → 𝐾 ≤ if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) |
| 59 | 2 | adantr | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → 𝐾 ∈ ℝ ) |
| 60 | 5 | a1i | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → 1 ∈ ℝ ) |
| 61 | simpr | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → ¬ 1 ≤ 𝐾 ) | |
| 62 | 59 60 61 | nleltd | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → 𝐾 < 1 ) |
| 63 | 59 60 62 | ltled | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → 𝐾 ≤ 1 ) |
| 64 | 41 | eqcomd | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → 1 = if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) |
| 65 | 63 64 | breqtrd | ⊢ ( ( 𝜑 ∧ ¬ 1 ≤ 𝐾 ) → 𝐾 ≤ if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) |
| 66 | 58 65 | pm2.61dan | ⊢ ( 𝜑 → 𝐾 ≤ if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) |
| 67 | 46 | nnrpd | ⊢ ( 𝜑 → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℝ+ ) |
| 68 | 2timesgt | ⊢ ( if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℝ+ → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) < ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) | |
| 69 | 67 68 | syl | ⊢ ( 𝜑 → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) < ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) |
| 70 | 2 57 56 66 69 | lelttrd | ⊢ ( 𝜑 → 𝐾 < ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) |
| 71 | 2 56 70 | ltled | ⊢ ( 𝜑 → 𝐾 ≤ ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) |
| 72 | 56 | ltpnfd | ⊢ ( 𝜑 → ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) < +∞ ) |
| 73 | 52 54 55 71 72 | elicod | ⊢ ( 𝜑 → ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ∈ ( 𝐾 [,) +∞ ) ) |
| 74 | 51 47 73 | fnfvimad | ⊢ ( 𝜑 → ( 𝐹 ‘ ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) ) ∈ ( 𝐹 “ ( 𝐾 [,) +∞ ) ) ) |
| 75 | 49 74 | eqeltrrd | ⊢ ( 𝜑 → 0 ∈ ( 𝐹 “ ( 𝐾 [,) +∞ ) ) ) |
| 76 | 18 | adantr | ⊢ ( ( 𝜑 ∧ 𝑛 = ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) → if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℤ ) |
| 77 | simpr | ⊢ ( ( 𝜑 ∧ 𝑛 = ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) → 𝑛 = ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) | |
| 78 | 2tp1odd | ⊢ ( ( if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ∈ ℤ ∧ 𝑛 = ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) → ¬ 2 ∥ 𝑛 ) | |
| 79 | 76 77 78 | syl2anc | ⊢ ( ( 𝜑 ∧ 𝑛 = ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) → ¬ 2 ∥ 𝑛 ) |
| 80 | 79 | iffalsed | ⊢ ( ( 𝜑 ∧ 𝑛 = ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) → if ( 2 ∥ 𝑛 , 0 , 1 ) = 1 ) |
| 81 | 47 | peano2nnd | ⊢ ( 𝜑 → ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ∈ ℕ ) |
| 82 | 1xr | ⊢ 1 ∈ ℝ* | |
| 83 | 82 | a1i | ⊢ ( 𝜑 → 1 ∈ ℝ* ) |
| 84 | 1 80 81 83 | fvmptd2 | ⊢ ( 𝜑 → ( 𝐹 ‘ ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) = 1 ) |
| 85 | 81 | nnxrd | ⊢ ( 𝜑 → ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ∈ ℝ* ) |
| 86 | 81 | nnred | ⊢ ( 𝜑 → ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ∈ ℝ ) |
| 87 | 56 | ltp1d | ⊢ ( 𝜑 → ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) < ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) |
| 88 | 2 56 86 70 87 | lttrd | ⊢ ( 𝜑 → 𝐾 < ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) |
| 89 | 2 86 88 | ltled | ⊢ ( 𝜑 → 𝐾 ≤ ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) |
| 90 | 86 | ltpnfd | ⊢ ( 𝜑 → ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) < +∞ ) |
| 91 | 52 54 85 89 90 | elicod | ⊢ ( 𝜑 → ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ∈ ( 𝐾 [,) +∞ ) ) |
| 92 | 51 81 91 | fnfvimad | ⊢ ( 𝜑 → ( 𝐹 ‘ ( ( 2 · if ( 1 ≤ 𝐾 , ( ⌈ ‘ 𝐾 ) , 1 ) ) + 1 ) ) ∈ ( 𝐹 “ ( 𝐾 [,) +∞ ) ) ) |
| 93 | 84 92 | eqeltrrd | ⊢ ( 𝜑 → 1 ∈ ( 𝐹 “ ( 𝐾 [,) +∞ ) ) ) |
| 94 | 75 93 | prssd | ⊢ ( 𝜑 → { 0 , 1 } ⊆ ( 𝐹 “ ( 𝐾 [,) +∞ ) ) ) |
| 95 | 15 94 | eqssd | ⊢ ( 𝜑 → ( 𝐹 “ ( 𝐾 [,) +∞ ) ) = { 0 , 1 } ) |