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arXiv 1202.0276math.CO
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一类具有非慢解的嵌套递归的组合解法

A combinatorial approach for solving certain nested recursions with non-slow solutions

Abraham Isgur, Vitaly Kuznetsov, Stephen Tanny

摘要:

我们定义了广义Golomb三角递归:g_{j,s,lambda}(n)= g_{j,s,lambda}(n-s-g_{j,s,lambda}(n-j))+ λ j.对于特定的初始条件的选择,我们表明,递归的解决方案是一个非慢单调序列,我们可以提供一个组合的解释,在加权计数的叶子的某个标记的无限树。我们发现,不止一个这样的树的解释是可能的,导致不同的选择的初始条件和替代方案是密切相关的。在这种情况下,λ = 1的初始条件,这些替代树的解释相吻合,我们推导出明确的封闭形式的解决方案序列及其频率函数。

英文摘要:

We define the generalized Golomb triangular recursion by g_{j,s,lambda}(n) = g_{j,s,lambda}(n - s - g_{j,s,lambda}(n-j)) + λj. For particular choices of the initial conditions, we show that the solution of the recursion is a non-slow monotone sequence for which we can provide a combinatorial interpretation in terms of a weighted count of the leaves of a certain labeled infinite tree. We discover that more than one such tree interpretation is possible, leading to different choices of the initial conditions and alternative solutions that are closely related. In the case lambda=1 the initial conditions for these alternative tree interpretations coincide and we derive explicit closed forms for the solution sequence and its frequency function.

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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