Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A plane curve defined as the set (or locus) of points in the plane such that the product of the distances to two fixed points is constant (related to an ellipse, for which the sum of the distances is constant).

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Named after the astronomer Giovanni Domenico Cassini, who studied them in 1680.

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