The intersection of hyper-quadric surfaces,or linear subspace and hyperquadric surfaces,can be solved easily by quadrictransformations
利用平方变换可以使每一类超二阶曲面和线性子空间，以及超二阶曲面之间的定位问题的解法得以简化。
The expression of a tangent cone family with one parameter about a quadric surface is discussed.
讨论了二阶曲面的单参数切锥族的表示方法,导出了单参数切锥族的包络面的方程。
Through concrete rectangular coordinates transformation,the invariant complete system for intersection line of quadratic algebraic surface with plane are given.
通过具体的直角坐标变换，详细地给出二次代数曲面与平面的交线即平截线的不变量完全系统，该系统不仅在理论上而且在实际应用中为彻底解决二次代数曲面平截线的有关问题提供了强有力的工具。
New Forms of Differential Geometry of Second Order Surface and Their Application to Gear Drive;
二阶曲面微分几何新形式及在齿轮传动中的应用
The Simplification Problem About Equtionof Curve of Order 2 on Projective Plane;
射影平面上二阶曲线方程的化简问题
Several Methods to Solve Asymptotic Line of Curve of Second Order on the Projective Plane;
射影平面上二阶曲线渐近线的几种求法
Feature Extraction of Sectional Curve in Reverse Engineering Based on Two Orders Discrete Curvature
基于二阶离散曲率的截面线特征提取算法
The Hypersurfaces in Unite Sphere with Semi-parallel and 2-order Parallel Mbius Second Fundamental Form;
球面中具有半平行和二阶平行Mbius第二基本形式的超曲面
tangent-cone of a qualric
二次曲面的切线锥面
conjugate diametral plane
共轭径面 -二次曲面的
conjugate diametral planes of a quadric
二次曲面的共轭径面
Study and Application of C-Bézier Curves and Surfaces of Degree n;
高阶C-Bézier曲线曲面性质研究及其应用
Degree Reduction of the Said-Ball Curves and Surfaces;
Said-Ball曲线曲面的降阶逼近
Research on Approximate Degree Reduction for Interval Rational Bezier Curves and Surfaces;
区间有理Bezier曲线、曲面的降阶逼近研究
The Study of Degree Reduction Approximation Algorithm for Wang-ball Curves and Surfaces
Wang-ball曲线、曲面的降阶逼近算法的研究
We call this surface the stress quadric.
我们称这个曲面为应力二次曲面。
double generator of a ruled surface
直纹曲面的二重母线
second fundamental form of a surface
曲面的第二基本形式
conjugate lines in a quadric
二次曲面的共轭直线
bifocal chord of a quadric
二次曲面的两焦点弦
Exact Observability for Second Order Quasilinear Hyperbolic Equations
二阶拟线性双曲型方程的精确能观性
