邻角
as directions of the points on the closed curve around singularity are continuous, and there is only one absolute value of difference between adjacent angles is greater than π/ 2, the formula of adjacent direction angles difference is adjusted.
沿围绕奇异点的封闭曲线,其上的点的方向角变化是连续的且只有一个方向角差值的绝对值大于π/2。
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