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mathworld.wolfram.com

Ellipsoid -- from Wolfram MathWorld

Tietze (1965, p. 28) calls the general ellipsoid with a "triaxial ellipsoid." If the lengths of two axes of an ellipsoid are the same, the figure is called an ellipsoid of revolution or spheroid. Denote the equal semi...

www.math.net

Ellipsoid - Math.net

Ellipsoid An ellipsoid is a 3D geometric figure that has an elliptical shape. It can be viewed as a stretched sphere. An ellipsoid gets its name from an ellipse. Any plane that cuts through an ellipsoid forms an ellip...

www.britannica.com

Ellipsoid | Surfaces, Axes, Foci | Britannica

Ellipsoid, closed surface of which all plane cross sections are either ellipses or circles. An ellipsoid is symmetrical about three mutually perpendicular axes that intersect at the centre. If a, b, and c are the prin...

baike.baidu.com

椭球坐标系_百度百科

长椭球与扁椭球坐标系的焦圆分布差异体现在xOy平面或旋转轴上,这一特性与共焦曲面族的结构密切相关 [4]。 中文名 椭球坐标系 外文名 ellipsoidal coordinates 学 科 数学 隶 属 正交曲线坐标系 相关坐标系 直角坐标系

handwiki.org

Ellipsoid - HandWiki

The expression [math]\displaystyle { (\mathbf {x}-\mathbf {v})^\mathsf {T}\! \boldsymbol {A}\, (\mathbf {x}-\mathbf {v}) } [/math] is also called the ellipsoidal norm of x - v.

www.mathinsight.org

The ellipsoid - Math Insight

Description of the ellipsoid with interactive graphics that illustrate cross sections and the effect of changing parameters.