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arXiv 0906.2295math.NT
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一个包含二项式系数的最小公倍数的恒等式及其应用

An identity involving the least common multiple of binomial coefficients and its application

Bakir Farhi

摘要:

本文证明了恒等式$$\lcm\{\binom{k}{0}, \binom{k}{1}, >..., \binom{k}{k}\} = \frac{\lcm(1, 2, ..., k, k + 1)}{k + 1} (\forall k \in \mathbb{N}) .$$作为应用,给出了著名的非平凡下界$\lcm(1, 2, ..., k) \geq 2^{k - 1}$ $(\forall k \geq 1)$的一个简单证明.

英文摘要:

In this paper, we prove the identity $$\lcm\{\binom{k}{0}, \binom{k}{1}, >..., \binom{k}{k}\} = \frac{\lcm(1, 2, ..., k, k + 1)}{k + 1} (\forall k \in \mathbb{N}) .$$ As an application, we give an easily proof of the well-known nontrivial lower bound $\lcm(1, 2, ..., k) \geq 2^{k - 1}$ $(\forall k \geq 1)$.

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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