Signed Curvature

Some articles on signed curvature:

Curvature of Plane Curves - Signed Curvature
... The sign of the signed curvature k indicates the direction in which the unit tangent vector rotates as a function of the parameter along the curve ... The signed curvature depends on the particular parametrization chosen for a curve ... More precisely, the signed curvature depends only on the choice of orientation of an immersed curve ...

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