where is the tangent vector defined by
Curvature Vector
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Cite this as:
Weisstein, Eric W. "Curvature Vector." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CurvatureVector.html
Weisstein, Eric W. "Curvature Vector." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CurvatureVector.html