Directrix (Ruled Surface)
The curve 
in the Ruled Surface parameterization
is called the directrix (or Base Curve).See also Director Curve, Ruled Surface
References
Gray, A. Modern Differential Geometry of Curves and Surfaces. Boca Raton, FL: CRC Press, p. 333, 1993.
- Linnik's Constant
- Linnik's Theorem
- Lin's Method
- Liouville Function
- Liouville Measure
- Liouville Number
- Liouville Polynomial Identity
- Liouville-Roth Constant
- Liouville's Boundedness Theorem
- Liouville's Conformality Theorem
- Liouville's Conic Theorem
- Liouville's Constant
- Liouville's Elliptic Function Theorem
- Liouville Space
- Liouville's Phase Space Theorem
- Liouville's Rational Approximation Theorem
- Liouville's Sphere-Preserving Theorem
- Lipschitz Condition
- Lipschitz Function
- Lipschitz's Integral
- Lissajous Curve
- Lissajous Figure
- List
- Lituus
- Lituus Inverse Curve