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Identities for the Rogers-Ramanujan Continued Fraction

Number Theory 2024-10-23 v1

Abstract

We prove some new modular identities for the Rogers\textendash Ramanujan continued fraction. For example, if R(q)R(q) denotes the Rogers\textendash Ramanujan continued fraction, then \begin{align*}&R(q)R(q^4)=\dfrac{R(q^5)+R(q^{20})-R(q^5)R(q^{20})}{1+R(q^{5})+R(q^{20})},\\ &\dfrac{1}{R(q^{2})R(q^{3})}+R(q^{2})R(q^{3})= 1+\dfrac{R(q)}{R(q^{6})}+\dfrac{R(q^{6})}{R(q)}, \end{align*}and\begin{align*}R(q^2)=\dfrac{R(q)R(q^3)}{R(q^6)}\cdot\dfrac{R(q) R^2(q^3) R(q^6)+2 R(q^6) R(q^{12})+ R(q) R(q^3) R^2(q^{12})}{R(q^3) R(q^6)+2 R(q) R^2(q^3) R(q^{12})+ R^2(q^{12})}.\end{align*} In the process, we also find some new relations for the Rogers-Ramanujan functions by using dissections of theta functions and the quintuple product identity.

Keywords

Cite

@article{arxiv.2410.17110,
  title  = {Identities for the Rogers-Ramanujan Continued Fraction},
  author = {Nayandeep Deka Baruah and Pranjal Talukdar},
  journal= {arXiv preprint arXiv:2410.17110},
  year   = {2024}
}

Comments

To appear in Journal of the Korean Mathematical Society