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arXiv 0907.3188math.CO
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$4 \times 4$幻方的Enumeration

Enumeration of $4 \times 4$ Magic Squares

Matthias Beck, Andrew Van Herick

摘要:

\emph{magic square}是不同正整数的$n \times n$数组,这些整数沿任何行、列或主对角线的和是相同的数。我们计算$n=4$的这种平方的数量,作为魔术和或条目上的上界的函数。这两项功能的先前记录是$n=3$病例。我们的方法是基于由内而外的多面体,即,超平面安排和埃赫哈特的理论相结合的格点计数。

英文摘要:

A \emph{magic square} is an $n \times n$ array of distinct positive integers whose sum along any row, column, or main diagonal is the same number. We compute the number of such squares for $n=4$, as a function of either the magic sum or an upper bound on the entries. The previous record for both functions was the $n=3$ case. Our methods are based on inside-out polytopes, i.e., the combination of hyperplane arrangements and Ehrhart's theory of lattice-point enumeration.

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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