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数学上,裤(英语:pair of pants)是形如一条裤的二维曲面;拓扑学上是一个有三个洞的球面,可被赋予双曲度量,而双曲度量的等距类是由边界曲线的长度(cuff lengths)决定,或与之对偶的由边界之间的距离(seam lengths)决定。
在双曲几何中,这三个洞视为同等,不区别“裤腰”和“裤脚”。配边理论中这三个洞不同等,一条裤是一个圆(裤腰)和两个圆(裤脚)之间的配边。
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