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arXiv 1301.4550math.CO
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一个计数函数

A Counting Function

Milan Janjic, Boris Petkovic

摘要:

我们定义了一个与二项式系数相关的计数函数。证明了该函数的一个显式公式。在某些特殊情况下,更简单的显式公式推导。我们还导出了一个公式的数量(0,1)-矩阵,有一个固定的数量为1的,并没有零行和零列。此外,我们证明了我们的函数满足几个递归关系。我们的计数函数与不同类别的整数的关系,然后检查。这些课程包括:不同类型的图形数,正方形金字塔表面上的点数,魔常数,截断平方数,切比雪夫多项式的系数,Catalan数,Dellanoy数,Sulanke数,配位序列数,立方晶格的水晶球序列数。在文章的最后一部分,我们证明了几个配置计数由我们的函数。其中包括:完全二部图的生成子图的个数,一个正方形所包含的正方形的个数,一条直线上点的着色数,某些特定数的因子数,整数的合成中所有部分的个数,整数的弱合成的个数,以及特定格路的个数.最后,我们计算车、象和皇后在棋盘上可能走的步数。本文中的大多数陈述都是通过本文中定义的插入的双射证明来提供的。这样我们就可以证明,不同的构形可以用同样的方法来计数。

英文摘要:

We define a counting function that is related to the binomial coefficients. An explicit formula for this function is proved. In some particular cases, simpler explicit formuls are derived. We also derive a formula for the number of (0,1)-matrices, having a fixed number of 1's, and having no zero rows and zero columns. Further, we show that our function satisfies several recurrence relations. The relationship of our counting function with different classes of integers is then examined. These classes include: different kind of figurate numbers, the number of points on the surface of a square pyramid, the magic constants, the truncated square numbers, the coefficients of the Chebyshev polynomials, the Catalan numbers, the Dellanoy numbers, the Sulanke numbers, the numbers of the coordination sequences, and the number of the crystal ball sequences of a cubic lattice. In the last part of the paper, we prove that several configurations are counted by our function. Some of these are: the number of spanning subgraphs of the complete bipartite graph, the number of square containing in a square, the number of coloring's of points on a line, the number of divisors of some particular numbers, the number of all parts in the compositions of an integer, the numbers of the weak compositions of integers, and the number of particular lattice paths. We conclude by counting the number of possible moves of the rook, bishop, and queen on a chessboard. The most statements in the paper are provided by bijective proofs in terms of insets, which are defined in the paper. With this we want to show that different configurations may be counted by the same method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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