两条平行的直线可以看作相交在无穷远点，所有的平行直线都交于同一个无穷远点。在球极投影中复平面上与复球面北极对应的点是无穷远点。
第二，我们借由球极投影可以看到，若于平面添加一无穷远点(point at infinity)，则我们就可以得到一个 S2 球面。
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In chapter 3, center conditions and bifurcation of limit cycles from the equator for a class of quintic polynomial system are studied. The recursion formula for the quintic polynomial system in the infinity are given.
第三章研究了一类五次多项式微分系统无穷远点的中心条件与极限环分支问题。
参考来源 - 几类微分自治系统的极限环分支·2,447,543篇论文数据，部分数据来源于NoteExpress
用一同胚变换将无穷远点转变成原点（初等奇点）。
The method was based on a homeomorphic transformation of the infinity into the origin(linear singular point).
用初等几何方法给出线性函数在无穷远点的保角性证明。
The use of elementary geometry method can give conformal demonstration of lineal function in infinite eigenvector.
文章通过变换，得出关于孤立高次奇点及无穷远点指数分解结论。
Through transforming, some conclusions are given about decomposing index number at higher order isolated singular point and infinite point in this paper.
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