Lemniscate of Bernoulli
lastmod 2015-11-06created 2015-11-061 edits
In geometry, the lemniscate of Bernoulli is defined as the plane curve such that, given two foci F1 and F2 at distance 2a from each other, every point P on the curve satisfies PF1·PF2 = a2. The curve is shaped like the numeral 8 or the symbol ∞, and its name comes from the Latin lemniscus, meaning "pendant ribbon". The curve is a special case of the Cassini oval and is a rational curve and an algebraic curve of degree 4.