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N one of a group of curves formed by the intersection of a plane and a right circular cone. It is either a circle, ellipse, parabola, or hyperbola, depending on the eccentricity, e, which is constant for a particular curve e = 0 for a circle; e<1 for an ellipse; e = 1 for a parabola; e>1 for a hyperbola 圆锥曲线 (Often shortened to conic)
His chief work was on the conic sections but he also wrote on other subjects.
他的主要著作是关于圆锥线的，但也写过其他方面的著作。
But don't ask for an explanation of his elegant proof unless you are interested in conic sections.
但是不要要求对他的优雅证明的解释，除非你对圆锥截面感兴趣。
Greek mathematician who first defined the conic sections called the parabola, hyperbola, and ellipse.
阿普罗涅斯：古希腊数学家，他最早定义了称为抛物线、双曲线和椭圆的圆锥形部分。
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