Tangent Indicatrix
Let the Speed 
of a closed curve on the unit sphere 
never vanish. Then the tangent indicatrix
is another closed curve on
. It is sometimes called the Tantrix. If Immerses in , then so will 
.
References
Solomon, B. ``Tantrices of Spherical Curves.'' Amer. Math. Monthly 103, 30-39, 1996.
- Lagrange's Group Theorem
- Lagrange's Identity
- Lagrange's Interpolating Fundamental Polynomial
- Lagrange's Lemma
- Lagrange Spectrum
- Lagrangian Coefficient
- Lagrangian Derivative
- Laguerre Differential Equation
- Laguerre-Gauss Quadrature
- Laguerre Polynomial
- Laguerre Quadrature
- Laguerre's Method
- Laguerre's Repeated Fraction
- Laisant's Recurrence Formula
- Lakshmi Star
- Lal's Constant
- Laman's Theorem
- Lambda Calculus
- Lambda Function
- Lambda Group
- Lambda Hypergeometric Function
- Lambert Azimuthal Equal-Area Projection
- Lambert Conformal Conic Projection
- Lambert Series
- Lambert's Method