We deduced equal perimeter inequality of triangle and quadrangle by elementary mathematical methods first and solved general equal perimeter problems by using methods of Fourier series.
本文首先使用初等方法导出三角形与四边形的等周不等式，进而用富里埃级数方法解决了一般等周问题。
This paper presents a method to define the quadrangle in the triangle mesh and puts forward a new mesh simplification algorithm based on quadrangle collapse.
通过定义三角网格模型中的两个以公共边相连的三角形构成一个空间四边形，提出了一种新的基于这种空间四边形折叠的网格简化算法。
The method of triangle mesh translated to quadrangle mesh is that delete common side of two adjacent triangle mesh.
三角形网格转化为四边形网格的方法是将两个相邻的三角形网格的公共边删除，使之转化为一个四边形单元。
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