plane spiric curve
||last updated: 2003-08-01
The conic section can be constructed as the
intersection of a conic with a plane. Replacing the conic by a torus, we get the
plane spiric curve 1).
The curve is a bicircular quartic.
When the plane is parallel to the axis of the torus (a=2, c=0), a spiric
section is formed.
1) speira (Gr.) = torus