Ellipsoid - Daenmen (English spelling)
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A quadratic surface. In the Cartesian coordinate system O- xyz , it is expressed by the equation x2 / a2 + y2 / b2 + z2 / c2 = 1 ( a , b , c > 0). This surface is symmetric with respect to each of the yz , zx , and xy planes. When a = b = c , it becomes a sphere. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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二次曲面の一つ。直交座標系O- xyz に関し，x2/a2＋y2/b2＋z2/c2＝1 ( a ，b ，c＞0 ) の方程式で表わされる。この曲面は yz 平面，zx 平面，xy 平面のおのおのに対し対称である。 a＝b＝c の場合は球面となる。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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