Elliptic coordinate system

In geometry, the elliptic(al) coordinate system is a two-dimensional orthogonal coordinate system in which the coordinate lines are confocal ellipses and hyperbolae. The two foci $F_{1}$ and $F_{2}$ are generally taken to be fixed at $-a$ and $+a$ , respectively, on the $x$ -axis of the Cartesian coordinate system.

单词	Elliptical coordinates
释义	Elliptical coordinates 英语百科 Elliptic coordinate system In geometry, the elliptic(al) coordinate system is a two-dimensional orthogonal coordinate system in which the coordinate lines are confocal ellipses and hyperbolae. The two foci $F_{1}$ and $F_{2}$ are generally taken to be fixed at $-a$ and $+a$ , respectively, on the $x$ -axis of the Cartesian coordinate system.
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Elliptical coordinates

Elliptic coordinate system