Spherical-code hierarchy #
General spectral bounds, localization, compactification, and strict hierarchy estimates.
The longitudinal degree used in the spherical-code argument.
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The transverse degree used in the spherical-code argument.
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The terminal edge rayleigh used in the spherical-code argument.
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The spectral gap used in the spherical-code argument.
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- MetricCodes.Spherical.GeneralSpectral.spectralGap s a b = (2 * MetricCodes.Gamma a b - s) / 2
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The spectral prefactor used in the spherical-code argument.
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The inclusion of unit sphere points into the ambient Euclidean space.
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- SpherePacking.spherePointEmbedding n = { toFun := Subtype.val, inj' := ⋯ }
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The embedding of a spherical code's attached point set into the unit sphere.
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The to codes used in the spherical-code argument.
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- C.toCodes = { points := Finset.map (SpherePacking.attachedSphereEmbedding C) C.points.attach, inner_le := ⋯ }
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The of codes used in the spherical-code argument.
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- SpherePacking.SphericalCode.ofCodes C = { points := Finset.map (SpherePacking.spherePointEmbedding n) C.points, unit_norm := ⋯, inner_le := ⋯ }
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The spherical code number used in the spherical-code argument.
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- SpherePacking.sphericalCodeNumber n s = ⨆ (C : SpherePacking.SphericalCode n s), ↑C.points.card
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The boundary rate set used in the spherical-code argument.
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The boundary variational rate used in the spherical-code argument.
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The localized envelope used in the spherical-code argument.
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- MetricCodes.Spherical.SidelnikovLocalization.localizedEnvelope κ s = sInf ((fun (t : ℝ) => κ t + MetricCodes.Spherical.SidelnikovLocalization.sliceCost s t) '' Set.Icc 0 s)
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Apply the quadratic-weight scaling coordinate change to every stabilizer parameter.
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The reciprocal quadratic-weight sum bounding the spectral loss from appending a parameter.
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- MetricCodes.Spherical.HigherHierarchy.appendSpectralLossUpper a b = ∑ i : Fin (r + 1), MetricCodes.Spherical.HigherHierarchy.lagrangeWeight a b i / (2 * (a i * (1 + a i)))
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The level rate used in the spherical-code argument.
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Subtract x from the first ambient entry, then set the last ambient entry to z.
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- MetricCodes.Spherical.HigherHierarchy.openingAmbient a x z = Function.update (Function.update a 0 (a 0 - x)) (Fin.last r) z
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Equality of initial values together with derivatives at zero related by the factor η.
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- MetricCodes.Spherical.HigherHierarchy.ScaledOpeningDerivative η f g = (f 0 = g 0 ∧ ∃ (d : ℝ), HasDerivAt f (η * d) 0 ∧ HasDerivAt g d 0)
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The boundary quadratic expressed in the reciprocal-scale parameter used for compactification.
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The square-root solution of the normalized boundary quadratic equation.
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The compactifying coordinate transformation u ↦ 1 / (1 + u).
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The combined index type for the ambient and stabilizer coordinates of a fixed hierarchy level.
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The unit cube containing the compactified ambient and stabilizer parameter tuples.
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Closure of the fixed-level rate bound under convergent spectral thresholds and entropy upper bounds.
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The ambient suffix remaining after the first k compactified coordinates are removed.
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- MetricCodes.Spherical.HigherHierarchy.compactifiedAmbientSuffix h A i = A ⟨k + ↑i, ⋯⟩
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The stabilizer suffix remaining after the first k compactified coordinates are removed.
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- MetricCodes.Spherical.HigherHierarchy.compactifiedStabilizerSuffix h B i = B ⟨k + ↑i, ⋯⟩
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The product of the first k compactified escaping-coordinate ratios.
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- MetricCodes.Spherical.HigherHierarchy.compactifiedEscapingRatioProduct hkj d = ∏ i : Fin k, d ⟨↑i, ⋯⟩
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Subsequential compactification of fixed-level families with bounded entropy into a residual hierarchy.
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The one-row boundary entropy difference between the ambient and boundary degrees.
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The entropy values of interlacing certificates at any rank satisfying the closed spectral constraint.
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The closed hierarchy variational rate used in the spherical-code argument.
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The spherical code rate used in the spherical-code argument.
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- MetricCodes.Spherical.HigherHierarchy.sphericalCodeRate s = Filter.limsup (fun (n : ℕ) => Real.logb 2 ↑(SpherePacking.sphericalCodeNumber n s).toNat / ↑n) Filter.atTop
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The fixed level hierarchy code bound used in the spherical-code argument.
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The square-root contraction factor comparing the cap thresholds s and t.
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Transfer of a finite hierarchy certificate to the variational bound after cap contraction.
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The localized level rate used in the spherical-code argument.
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The localized hierarchy rate used in the spherical-code argument.
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The localized row rate used in the spherical-code argument.
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The classical localized rate used in the spherical-code argument.
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