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LeanPool.ClassificationOfSurfaces.Moise.IntrinsicCloseCellwiseExtension

Cellwise extension of a close intrinsic graph approximation #

This file applies polygonal Schoenflies face by face to the arbitrarily close graph embedding from IntrinsicCloseGraphApproximation. The proofs parallel the first intrinsic cellwise construction, but the boundary map is now the second, metrically controlled graph replacement.

The polygon which is the exact image of one close face-boundary map.

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    A certified PL filling of one close face boundary.

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      The finite family of close face fillings, glued on the canonical realization.

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        The approximated graph avoids the selected closed region of every nonincident face at all outside vertices.

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          The global close graph avoids the bounded interior selected for every filled face.

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            The endpoint exterior condition propagates along each connected intrinsic edge, so the whole close graph avoids every nonincident bounded face interior.

            theorem LeanEval.Topology.ClassificationOfSurfaces.Moise.IntrinsicTwoComplex.CloseGraphApproximation.closeCellwiseMap_dist_le {K : IntrinsicTwoComplex} {h : K.realizationPlane} {hcont : Continuous h} {hinj : Function.Injective h} {D : K.VertexDiskControl h} {C : K.CentralTubeControl hcont hinj D} {ε : } (A : CloseGraphApproximation ε) {η ρ : } (hsmall : ∀ (t : K.Face), xK.faceCarrier t, yK.faceCarrier t, dist (h x) (h y) < η) (hclose : xK.oneSkeleton, dist (A.intrinsicMap x) (h x) < ρ) (x : K.realization) :
            dist (A.closeCellwiseMap x) (h x) η + ρ

            Quantitative control of the close cellwise filling.

            Distinct face polygons have disjoint bounded interiors once the global graph avoids all of them.

            A compatible close cellwise filling presents the intrinsic source as one finite pure plane complex.

            theorem LeanEval.Topology.ClassificationOfSurfaces.Moise.IntrinsicTwoComplex.exists_intrinsic_pl_approximation (K : IntrinsicTwoComplex) {h : K.realizationPlane} (hcont : Continuous h) (hinj : Function.Injective h) {ε : } ( : 0 < ε) :
            ∃ (L : PlaneComplex) (_ : L.IsPure2) (e : L.support ≃ₜ K.realization), ∀ (p : L.support), dist (↑p) (h (e p)) < ε

            Intrinsic-source form of Moise Ch. 6, Thm. 3. A continuous embedding of a finite intrinsic two-complex into the plane can be replaced by a finite pure plane triangulation whose coordinate embedding is uniformly close to the original one.