摘要
根据既是共轭又互相垂直的直径对有心二次曲线(双曲线椭圆)进行建模研究,建立了有心二次曲线和类似建立了无心二次曲线(抛物线)主轴方程的模型,推证得知,任意无穷远点关于二次曲线的极线都是直径。而且它们都通过中心,有心二次曲线有一对主轴,无心二次曲线仅一个主轴。
This paper to aims-e estabhsh the model of the principal axis of the conic. According to the diameter that is both coniugate and perpendicular we can establish the model of the centered conic. From the research we can conclude that the plume of the infinite point to the conic is diameter, and they all pass the center. Centered conic has a principal axis. noncentral conic has only one principal axis.
出处
《陕西教育学院学报》
2007年第1期98-100,共3页
Journal of Shaanxi Institute of Education
关键词
主轴
极点
极线
对称轴
调和共轭
共轭直径
无穷远点
无穷远直线
main axis
limit point
limit line
symmetry axis
harmonic conjugate
conjugate diameter, infinite point
infinite beeline
