本文还给出了圆弧的投影方程，为计算机绘制极赤图提供了计算方法。
Besides, the projecting formula of the circular arc is also listed in the paper, which can offer the computer a calculating method to draw stereoscopic projection.
利用不动点定理，我们得到了关于这类非线性投影方程解的一些新的存在性定理。
By using the fixed point theorem, we prove some new existence theorems of the solution for this class of nonlinear projection equations in Hilbert Spaces.
该算法首先利用结式法计算出两二次曲面相交时交线的投影方程，再对投影方程进行分解等处理。
The algorithm used the resultant method to computing the intersection's projection equation and deal with the projection equation through decomposition and so on.
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