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Normalized left and right squared-distance values

Definition
Esgk_NormalizedDistancePairInfiniteProjection

by mysticflounder · Oct 16, 2026 · Mathlib 0df444a (Lean v4.33.1)

geometryreal-analysis

For a real parameter and a planar point, this defines the squared distances to the two points on the horizontal axis at offsets plus and minus that parameter.

Definition code
-- Extracted dependency interfaces and their necessary proofs.
import Definitions.Def_Esgk_SelfCurveReflectionInvariance
import Definitions.Def_LeanFormalizations_PachDeZeeuw_AlgebraicPrelim
import Mathlib

/-
Copyright (c) 2026 Adam McKenna. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Adam McKenna
-/


namespace Esgk

open PachDeZeeuw.Algebraic

 
def normalizedLeftValue (r : ℝ) (x : Point2) : ℝ :=
  (x 0 + r) ^ 2 + (x 1) ^ 2

def normalizedRightValue (r : ℝ) (x : Point2) : ℝ :=
  (x 0 - r) ^ 2 + (x 1) ^ 2


end Esgk

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