基本解释：和积互变公式
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The permanent of matrix plays an important role in Combinatorial Mathematics, especially in Graph Theo-ry , but its application is still not as wide as that of determinant of matrix, because it is very difficult to calculate the value of permanent.不变积和式(permanent)在组合数学特别是图论中占有重要的位置,一直受到人们的关注。
In this paper, the differential and integral formulas for area coordinates in quadrilateral elements are presented.文献［１］系统地论述了四边形单元面积坐标理论，本文是文献［１］的续篇，补充论述采用四边形单元面积坐标时的微分和积分公式。
The main purpose of this paper is using the Fourier expansion of the Bernoulli Polynomial to study the reciprocity formula of Dedekind sums and give a new and easiest proof for it.利用Ｂｅｒｎｏｕｌｉ多项式的Ｆｏｕｒｉｅｒ展开式给出著名的Ｄｅｄｅｋｉｎｄ和互反公式的一个新的并且最简单的证
