Rufus Bowen

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 $\gamma (t)\,$ be a closed curve with nowhere-vanishing tangent vector ${\dot {\gamma }}$. Then the tangent indicatrix $T(t)\,$ of $\gamma \,$ is the closed curve on the unit sphere given by $T={\frac {\dot {\gamma }}{|{\dot {\gamma }}|}}$.

The total curvature of $\gamma \,$ (the integral of curvature with respect to arc length along the curve) is equal to the arc length of $T\,$.

References

• Solomon, B. "Tantrices of Spherical Curves." Amer. Math. Monthly 103, 30-39, 1996.

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1 Objection of HostGator.

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