Is Dist Bounded norm Power Series zpow
Space.IsDistBounded.normPowerSeries_zpow
Project documentation
A power series which is differentiable everywhere, and in the limit as n → ∞ tends to ‖x‖. -/ def normPowerSeries {d} : ℕ → Space d → ℝ := fun n x => √(‖x‖ ^ 2 + 1/(n + 1)) lemma normPowerSeries_eq (n : ℕ) : normPowerSeries (d := d) n = fun x => √(‖x‖ ^ 2 + 1/(n + 1)) := rfl lemma normPowerSeries_eq_rpow {d} (n : ℕ) : normPowerSeries (d := d) n = fun...
Exact Lean statement
@[fun_prop]
lemma IsDistBounded.normPowerSeries_zpow {d : ℕ} {n : ℕ} (m : ℤ) :
IsDistBounded (d := d) (fun x => (normPowerSeries n x) ^ m)Formal artifact
Lean source
@[fun_prop]lemma IsDistBounded.normPowerSeries_zpow {d : ℕ} {n : ℕ} (m : ℤ) : IsDistBounded (d := d) (fun x => (normPowerSeries n x) ^ m) := by match m with | .ofNat m => simp only [Int.ofNat_eq_natCast, zpow_natCast] apply IsDistBounded.mono (f := fun (x : Space d) => (‖x‖ + 1) ^ m) · fun_prop · fun_prop intro x simp only [norm_pow, Real.norm_eq_abs] refine pow_le_pow_left₀ (by positivity) ?_ m rw [abs_of_nonneg (by simp),abs_of_nonneg (by positivity)] exact normPowerSeries_le_norm_sq_add_one n x | .negSucc m => simp only [zpow_negSucc] apply IsDistBounded.mono (f := fun (x : Space d) => ((√(1/(n + 1)) : ℝ) ^ (m + 1))⁻¹) · fun_prop · exact (((normPowerSeries_differentiable n).continuous.pow _).inv₀ fun x => pow_ne_zero _ (normPowerSeries_ne_zero n x)).aestronglyMeasurable · intro x simp only [norm_inv, norm_pow, Real.norm_eq_abs, one_div] refine inv_anti₀ (by positivity) (pow_le_pow_left₀ (abs_nonneg _) ?_ _) rw [abs_of_nonneg (by positivity), abs_of_nonneg (by simp), normPowerSeries_eq] exact Real.sqrt_le_sqrt (by simp)- Project
- Physlib
- License
- Apache-2.0
- Commit
- dd43e9e65791
- Source
- Physlib/SpaceAndTime/Space/Norm/Basic.lean:255-279
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