Striction Curve
A Noncylindrical Ruled Surface always has a parameterization of the form
 | (1) |
, 
, and 
is called the striction curve of x. Furthermore, the striction curve does not depend on the choice of the base curve. The striction andDirector Curves of the Helicoid  | (2) |
 |  |  | (3) |
 | |  | (4) |
For the Hyperbolic Paraboloid
 | (5) |
| |  | (6) |
| |  | (7) |
See also Director Curve, Distribution Parameter, Noncylindrical Ruled Surface, Ruled Surface
References
Gray, A. ``Noncylindrical Ruled Surfaces'' and ``Examples of Striction Curves of Noncylindrical Ruled Surfaces.'' §17.3 and 17.4 in Modern Differential Geometry of Curves and Surfaces. Boca Raton, FL: CRC Press, pp. 345-350, 1993.
- Helicoid
- Helix
- Helly Number
- Helly's Theorem
- Helmholtz Differential Equation
- Helmholtz Differential Equation--Bipolar Coordinates
- Helmholtz Differential Equation--Cartesian Coordinates
- Helmholtz Differential Equation--Circular Cylindrical Coordinates
- Helmholtz Differential Equation--Confocal Ellipsoidal Coordinates
- Helmholtz Differential Equation--Confocal Paraboloidal Coordinates
- Helmholtz Differential Equation--Conical Coordinates
- Helmholtz Differential Equation--Elliptic Cylindrical Coordinates
- Helmholtz Differential Equation--Oblate Spheroidal Coordinates
- Helmholtz Differential Equation--Parabolic Coordinates
- Helmholtz Differential Equation--Parabolic Cylindrical Coordinates
- Helmholtz Differential Equation Polar Coordinates
- Helmholtz Differential Equation--Prolate Spheroidal Coordinates
- Helmholtz Differential Equation--Spherical Coordinates
- Helmholtz Differential Equation--Spherical Surface
- Helmholtz Differential Equation--Toroidal Coordinates
- Helmholtz's Theorem
- Helson-Szegö Measure
- Hemicylindrical Function
- Hemisphere
- Hemispherical Function