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Distance to a prime Reeb orbit in the tube around it is comparable to the normal coordinate

Proved
FiniteEnergyPlane.exists_mul_norm_le_infDist_proj_add_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 SSS. There are c,ρ>0c, \rho > 0c,ρ>0 such that for every τ\tauτ and every h∈ξx(τ)h \in \xi_{x(\tau)}h∈ξx(τ)​ with ∥h∥≤ρ\|h\| \leq \rho∥h∥≤ρ, the point proj(x(τ)+h)\mathrm{proj}(x(\tau) + h)proj(x(τ)+h) has distance at least c∥h∥c \|h\|c∥h∥ from the image of PPP.

So in the tube coordinates (τ,h)(\tau, h)(τ,h) around PPP, the normal coordinate is controlled by the distance to the orbit.

Preamble
import Definitions.Def_FiniteEnergyPlane_Winding
Formal statement
namespace FiniteEnergyPlane

open MeasureTheory Metric Filter Topology
open scoped ContDiff ENNReal Real

/-- Distance to a prime orbit in the tube around it. For a prime periodic Reeb orbit `P = (x, T)`
there are `c, ρ > 0` such that for every `τ` and every `h ∈ ξ_{x(τ)}` with `‖h‖ ≤ ρ`, the point
`proj (x(τ) + h)` has distance at least `c ‖h‖` from the image of `P`. -/
theorem exists_mul_norm_le_infDist_proj_add_of_isPrime {n : ℕ} (H : V n → ℝ)
    (hH : IsStrictlyStarShapedLevel H) (J : V n → V n →L[ℝ] V n)
    (hJ : IsCompatibleXiStructure H J) (P : ReebOrbit H) (hP : P.IsPrime) :
    ∃ c > 0, ∃ ρ > 0, ∀ (τ : ℝ) (h : V n), IsInXi H (P.x τ) h → ‖h‖ ≤ ρ →
      c * ‖h‖ ≤ infDist (proj H (P.x τ + h)) (Set.range P.x) := by
  sorry

end FiniteEnergyPlane
Source
U. Hryniewicz, Trans. AMS 364 (2012), § 6

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