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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1409.3869math.CO
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矩形网格上的无邻接选择

Selections Without Adjacency on a Rectangular Grid

Jacob A. Siehler

摘要:

利用T(m,n; k)表示从一个(m × n)矩形网格中选出k个正方形的方法的数目,给出了T(2,n;k)的一个公式,证明了这些数目所满足的一些恒等式,并证明了T(2,n;k)由n中的一个k次多项式给出.我们给出了多项式的前几个(最重要的)系数的简单公式。对T(3,n;k)也给出了相应的结果.最后,我们证明了单峰定理,特别是,如何选择k,以最大化T(2,n;k)。

英文摘要:

Using T(m,n;k) to denote the number of ways to make a selection of k squares from an (m x n) rectangular grid with no two squares in the selection adjacent, we give a formula for T(2,n;k), prove some identities satisfied by these numbers, and show that T(2,n;k) is given by a degree k polynomial in n. We give simple formulas for the first few (most significant) coefficients of the polynomials. We give corresponding results for T(3,n;k) as well. Finally we prove a unimodality theorem which shows, in particular, how to choose k in order to maximize T(2,n;k).

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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