How to find a unit speed curve [math]r(s)[/math] with curvature [math]\kappa(s) =\frac{1}{1 + s^2}[/math] and torsion [math]\tau(s)=0[/math] (differential geometry, math) - Quora
Kappa Curve -- from Wolfram MathWorld
epsilon \kappa $$ -Curves: controlled local curvature extrema | The Visual Computer
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