Torsion of a curve
Mathematical measure of how much a curve twists / From Wikipedia, the free encyclopedia
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For other notions of torsion, see Torsion (disambiguation).
In the differential geometry of curves in three dimensions, the torsion of a curve measures how sharply it is twisting out of the osculating plane. Taken together, the curvature and the torsion of a space curve are analogous to the curvature of a plane curve. For example, they are coefficients in the system of differential equations for the Frenet frame given by the Frenet–Serret formulas.
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