一个关于相对法曲率和相对短程挠率的定理及其证明

A Theorem about Relative Curvature and Relative Shor t-distance Torsion

介绍了用两相切曲面于切点处相联系的曲挠圆，推导一种利用中曲率和曲挠圆半径矢量求相对法曲率和相对短程挠率的简便方法。

A concise method is deduced to calculate the rel ative curvature and relative short-distance torsion form related two surfaces' c urvature and short-distance torsion circles(or Moore circles)at the tangent poin t,which takes advantage of the average curvatures and Moore circle radivus vecto rs.