: Mathématiques: elliptic coordinates

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elliptic coordinates

In geometry, the elliptic coordinate system is a two-dimensional orthogonal coordinate system in which the coordinate lines are confocal ellipses and hyperbolae. The two foci ${\\displaystyle F_{1}}$ and ${\\displaystyle F_{2}}$ are generally taken to be fixed at ${\\displaystyle -a}$ and ${\\displaystyle +a}$ , respectively, on the ${\\displaystyle x}$ -axis of the Cartesian coordinate system.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Elliptic_coordinate_system)

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