A generalization of the ring Torus produced by stretching or compressing in the direction. It is
given by the parametric equations

**References**

Gray, A. ``Tori.'' §11.4 in *Modern Differential Geometry of Curves and Surfaces.*
Boca Raton, FL: CRC Press, pp. 218-220, 1993.

© 1996-9

1999-05-25