螺线

螺线又稱渦線、渦卷（）是指一些围着某些定点或轴旋转且不断收缩或扩展的曲线。

 二维螺线 
 费马螺线
 等角螺线
 双曲螺线
 圆内螺线
 阿基米德螺线
 连锁螺线
 柯奴螺线
 欧拉螺線

 参考文献 
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