He also proposed and discussed the problem of isoperimetric figures.
他还提出并讨论过等周问题。
The isoperimetric problem is one of the basic differential geometric problems.
平面上等周问题是微分几何的基本问题之一。
Isoperimetric number is one of the crucial parameters of interconnection networks closely related to the connectivity and parameters, such as bisection width of graphs.
等周数是互联网络的一个重要参数，它与图的连通性和二部带宽等参数密切相关。
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