出典:Wikipedia
出典:『Wikipedia』 (2011/05/30 00:51 UTC 版)
In mathematics, a paraboloid is a quadric surface of special kind. There are two kinds of paraboloids: elliptic and hyperbolic. The elliptic paraboloid is shaped like an oval cup and can have a maximum or minimum point. In a suitable coordinate system with three axes x, y and z, it can be represented by the equation