Piriform
A plane curve also called the Peg Top and given by the Cartesian equation
 | (1) |
 |  |  | (2) |
 | |  | (3) |
for
. It was studied by G. de Longchamps in 1886. The generalization to a Quartic 3-Dsurface | (4) |
References
Cundy, H. and Rollett, A. Mathematical Models, 3rd ed. Stradbroke, England: Tarquin Pub. p. 71, 1989. Lawrence, J. D. A Catalog of Special Plane Curves. New York: Dover, pp. 148-150, 1972. Nordstrand, T. ``Surfaces.'' http://www.uib.no/people/nfytn/surfaces.htm.
- Iwasawa's Theorem
- j
- Jackson's Difference Fan
- Jackson's Identity
- Jackson's Theorem
- Jacobi Algorithm
- Jacobian
- Jacobian Conjecture
- Jacobian Curve
- Jacobian Determinant
- Jacobi-Anger Expansion
- Jacobian Group
- Jacobi Differential Equation
- Jacobi Differential Equation (Calculus of Variations)
- Jacobi Elliptic Functions
- Jacobi Function of the First Kind
- Jacobi Function of the Second Kind
- Jacobi-Gauss Quadrature
- Jacobi Identities
- Jacobi Matrix
- Jacobi Method
- Jacobi Polynomial
- Jacobi Quadrature
- Jacobi Rotation Matrix
- Jacobi's Curvature Theorem