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Lower Lipschitz bound along a prime Reeb orbit

Proved
FiniteEnergyPlane.exists_mul_abs_sub_le_norm_sub_of_isPrime

by Mazecto · Nov 6, 2026 · Mathlib 0df444a (Lean v4.33.1)

pseudoholomorphic-curvessymplectic-geometry

Let P=(x,T)P = (x, T)P=(x,T) be a prime periodic Reeb orbit on a strictly star-shaped level. Then there is c>0c > 0c>0 with c∣τ−τ′∣≤∥x(τ)−x(τ′)∥c |\tau - \tau'| \le \|x(\tau) - x(\tau')\|c∣τ−τ′∣≤∥x(τ)−x(τ′)∥ whenever ∣τ−τ′∣≤T/2|\tau - \tau'| \le T/2∣τ−τ′∣≤T/2.

Role. A prime orbit is a uniformly embedded circle.

Preamble
import Definitions.Def_FiniteEnergyPlane_Winding
Formal statement
namespace FiniteEnergyPlane

open MeasureTheory Metric Filter Topology
open scoped ContDiff ENNReal Real

/-- On a prime periodic Reeb orbit, `‖x(τ) - x(τ')‖` is bounded below by a multiple of `|τ - τ'|`
whenever `|τ - τ'| ≤ T / 2`. -/
theorem exists_mul_abs_sub_le_norm_sub_of_isPrime {n : ℕ} (H : V n → ℝ)
    (hH : IsStrictlyStarShapedLevel H) (P : ReebOrbit H) (hP : P.IsPrime) :
    ∃ c > 0, ∀ τ τ' : ℝ, |τ - τ'| ≤ P.T / 2 → c * |τ - τ'| ≤ ‖P.x τ - P.x τ'‖ := by
  sorry

end FiniteEnergyPlane
Source
Elementary lemma in the setting of U. Hryniewicz, Fast finite-energy planes in symplectizations and applications, Trans. AMS 364 (2012), arXiv:0812.4076

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