Plücker's Conoid
A Ruled Surface sometimes also called the Cylindroid. von Seggern (1993) gives the general functional form as
 | (1) |
 | (2) |
 |  |  | (3) |
 | |  | (4) |
 | |  | (5) |
A generalization of Plücker's conoid to 
folds is given by
| | | (6) |
| | | (7) |
| |  | (8) |
(Gray 1993). The cylindroid is the inversion of the Cross-Cap (Pinkall 1986).See also Cross-Cap, Right Conoid, Ruled Surface
References
Fischer, G. (Ed.). Mathematical Models from the Collections of Universities and Museums. Braunschweig, Germany: Vieweg, pp. 4-5, 1986. Gray, A. Modern Differential Geometry of Curves and Surfaces. Boca Raton, FL: CRC Press, pp. 337-339, 1993. Pinkall, U. Mathematical Models from the Collections of Universities and Museums (Ed. G. Fischer). Braunschweig, Germany: Vieweg, p. 64, 1986. von Seggern, D. CRC Standard Curves and Surfaces. Boca Raton, FL: CRC Press, p. 288, 1993.
- Elongated Triangular Gyrobicupola
- Elongated Triangular Orthobicupola
- Elongated Triangular Pyramid
- Elsasser Function
- Wilson's Primality Test
- Wilson's Theorem
- Wilson's Theorem Corollary
- Wilson's Theorem (Gauss's Generalization)
- Winding Number (Contour)
- Winding Number (Map)
- Windmill
- Window Function
- Winkler Conditions
- Winograd Transform
- Wirtinger's Inequality
- Wirtinger-Sobolev Isoperimetric Constants
- Witch of Agnesi
- Witness
- Wittenbauer's Parallelogram
- Wittenbauer's Theorem
- Witten's Equations
- Wolstenholme's Theorem
- Woodall Number
- Woodbury Formula
- Word