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arXiv 2402.02546math.NT
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二十面体方程在Rogers-Ramanujan连分数中的应用

Applications of the icosahedral equation for the Rogers-Ramanujan continued fraction

John M. Campbell

AI总结:

本文利用二十面体方程和模关系,通过Wolfram语言的RootApproximant命令,系统发现并证明了Rogers-Ramanujan连分数在特定指数处的根式闭式表达式,包括一个计算上困难的$R(e^{-\pi\sqrt{48/5}})$值。

摘要:

设$R(q)$表示满足$|q|<1$的Rogers-Ramanujan连分数。通过将Wolfram语言中的RootApproximant命令应用于涉及Yi给出的模关系中出现的theta函数$f(-q) := (q;q)_{\infty}$的表达式,这提供了一种系统的方法来实验性地发现$R\big(e^{-\pi\sqrt{r}}\big)$(其中$r \in \mathbb{Q}_{> 0}$)的求值。我们成功地应用此方法,获得了Rogers-Ramanujan连分数在$\mathbb{Q}$上的根式形式的显式闭式表达式,这些表达式此前未被发现或证明。我们利用$R$的二十面体方程以及Ramanujan的$G$-和$g$-函数的闭式表达式及其相关的模关系来证明我们的闭式表达式。我们引入并证明的一个特别显著的闭式表达式是$R\big( e^{-\pi\sqrt{48/5} } \big)$,鉴于在计算$G_{48/5}$时应用25阶模关系所面临的计算困难。

英文摘要:

Let $R(q)$ denote the Rogers-Ramanujan continued fraction for $|q| < 1$. By applying the RootApproximant command in the Wolfram language to expressions involving the theta function $f(-q) := (q;q)_{\infty}$ given in modular relations due to Yi, this provides a systematic way of obtaining experimentally discovered evaluations for $R\big(e^{-π\sqrt{r}}\big)$, for $r \in \mathbb{Q}_{> 0}$. We succeed in applying this approach to obtain explicit closed forms, in terms of radicals over $\mathbb{Q}$, for the Rogers-Ramanujan continued fraction that have not previously been discovered or proved. We prove our closed forms using the icosahedral equation for $R$ together with closed forms for and modular relations associated with Ramanujan's $G$- and $g$-functions. An especially remarkable closed form that we introduce and prove is for $R\big( e^{-π\sqrt{48/5} } \big)$, in view of the computational difficulties surrounding the application of an order-25 modular relation in the evaluation of $G_{48/5}$.

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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