Convex model reverse radial variational transport
ProvedBirkhoffGlobalSection.convex_model_reverse_radial_variational_transportconvex-geometryreal-analysis
Under the supplied normalized model trajectory and variational hypotheses, the inverse radial chart transports energy-tangent variations back to sphere Reeb variations.
All displayed regularity, tangency, normalization and supplied-data hypotheses of the exact formal statement are retained. This is a conditional result for the defined convex regularization model, not a global-section or index-existence theorem.
Preamble
import Theorems.Thm_BirkhoffGlobalSection_reverse_radial_variation_bundle open BirkhoffGlobalSection Set Filter SignType open scoped ContDiff Topology set_option linter.unusedVariables false set_option autoImplicit false set_option maxHeartbeats 800000
Formal statement
theorem BirkhoffGlobalSection.convex_model_reverse_radial_variational_transport :
∀ {μ c : ℝ}
(M : ConvexRegularizationModel μ c) (x v : ℝ → Phase)
(hs : ∀ t, x t ∈ frontier M.body)
(hx : ∀ t, HasDerivAt x
((phaseRadialContact (x t) (hamiltonianVectorField M.modelHamiltonian (x t)))⁻¹ •
hamiltonianVectorField M.modelHamiltonian (x t)) t)
(hv : ∀ t, HasDerivAt v
(fderiv ℝ (fun y =>
(phaseRadialContact y (hamiltonianVectorField M.modelHamiltonian y))⁻¹ •
hamiltonianVectorField M.modelHamiltonian y) (x t) (v t)) t)
(h0 : fderiv ℝ M.modelHamiltonian (x 0) (v 0) = 0),
let q : ℝ → Phase := fun t => radialNormalize (x t)
let w : ℝ → Phase := fun t => fderiv ℝ radialNormalize (x t) (v t)
(∀ t, q t ∈ unitThreeSphere) ∧
(∀ t, HasDerivAt q (convexModelSphereReebField M (q t)) t) ∧
(∀ t, HasDerivAt w (fderiv ℝ (convexModelSphereReebField M) (q t) (w t)) t) ∧
(∀ t, q t 0 * w t 0 + q t 1 * w t 1 + q t 2 * w t 2 + q t 3 * w t 3 = 0) ∧
(∀ t, fderiv ℝ (fun u : Phase => (gauge M.body u)⁻¹ • u) (q t) (w t) = v t) := by sorrySource
Independent extraction of component 12 of the Proved theorem BirkhoffGlobalSection.reverse_radial_variation_bundle. Original verified source: Solutions/Sol_BirkhoffGlobalSection_reverse_radial_variation_bundle.lean. Exact original component retained.