Tangent indicatrix
Appearance
In differential geometry, the tangent indicatrix of a closed space curve is a curve on the unit sphere intimately related to the curvature of the original curve. Let be a closed curve with nowhere-vanishing tangent vector . Then the tangent indicatrix of is the closed curve on the unit sphere given by .
The total curvature of (the integral of curvature with respect to arc length along the curve) is equal to the arc length of .
References
- Solomon, B. "Tantrices of Spherical Curves." American Mathematical Monthly 103, 30–39, 1996.