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VANISHING COEFFICIENTS IN FOUR QUOTIENTS OF INFINITE PRODUCT EXPANSIONS

Part of: Discontinuous groups and automorphic forms Series expansions

Published online by Cambridge University Press:  20 March 2019

DAZHAO TANG
DAZHAO TANG*
Affiliation:
College of Mathematics and Statistics, Chongqing University, Huxi Campus LD204, Chongqing 401331, PR China email [email protected]
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Abstract

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Motivated by Ramanujan’s continued fraction and the work of Richmond and Szekeres [‘The Taylor coefficients of certain infinite products’, Acta Sci. Math. (Szeged)40(3–4) (1978), 347–369], we investigate vanishing coefficients along arithmetic progressions in four quotients of infinite product expansions and obtain similar results. For example, $a_{1}(5n+4)=0$, where $a_{1}(n)$ is defined by

$$\begin{eqnarray}\displaystyle {\displaystyle \frac{(q,q^{4};q^{5})_{\infty }^{3}}{(q^{2},q^{3};q^{5})_{\infty }^{2}}}=\mathop{\sum }_{n=0}^{\infty }a_{1}(n)q^{n}. & & \displaystyle \nonumber\end{eqnarray}$$

Keywords

vanishing coefficientsquotients of infinite productJacobi’s triple product identityquintuple product identity

MSC classification

Primary: 11F33: Congruences for modular and $p$-adic modular forms
Secondary: 30B10: Power series (including lacunary series)
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 100 , Issue 2 , October 2019 , pp. 216 - 224
Copyright
© 2019 Australian Mathematical Publishing Association Inc. 

Footnotes

This work was supported by the National Natural Science Foundation of China (No. 11501061) and the Fundamental Research Funds for the Central Universities (No. 2018CDXYST0024).

References

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