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- [47] Powers of Jacobi triple product, Cohen’s numbers and the Ramanujan Δ\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\Delta }$$\end{document}-function European Journal of Mathematics, 2018, 4 (2) : 561 - 584