Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-27T19:48:58.837Z Has data issue: false hasContentIssue false

A simple proof of an expansion of an eta-quotient as a Lambert series

Published online by Cambridge University Press:  17 April 2009

Shaun Cooper
Affiliation:
Institute of Information and Mathematical Sciences, Massey University - Albany, Private Bag 102904, North Shore Mail Centre, Auckland, New Zealand, e-mail: [email protected]
Rights & Permissions [Opens in a new window]

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We give a simple proof of the identity The proof uses only a few well-known properties of the cubic theta functions a(q), b(q) and c(q). We show this identity implies the interesting definite integral .

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 2005

References

[1]Berndt, B.C., Ramanujan's Notebooks, Part III (Springer-Verlag, New York, 1991).CrossRefGoogle Scholar
[2]Berndt, B.C., Ramanujan's Notebooks, Part V (Springer-Verlag, New York, 1998).CrossRefGoogle Scholar
[3]Berndt, B.C., Chan, S.H., Liu, Z.-G. and Yesilyurt, H., ‘A new identity for with an application to Ramanujan's partition congruence modulo 11’, Q.J. Math. 55 (2004), 1330.CrossRefGoogle Scholar
[4]Borwein, J.M. and Garvan, F.G., ‘Approximations to π via the Dedekind eta function’, CMS Conf. Proc. 20 (1997), 89115.Google Scholar
[5]Borwein, J.M. and Borwein, P.B., ‘A cubic counterpart of Jacobi's identity and the AGM’, Trans. Amer. Math. Soc. 323 (1991), 691701.Google Scholar
[6]Borwein, J.M., Borwein, P.B. and Garvan, F.G., ‘Some cubic modular identities of Ramanujan’, Trans. Amer. Math. Soc. 343 (1994), 3547.CrossRefGoogle Scholar
[7]Chapman, R., ‘Cubic identities for theta series in three variables’, Ramanujan J. 8 (2004), 459465.CrossRefGoogle Scholar
[8]Cooper, S., ‘Cubic theta functions’, J. Comput. Appl. Math. 160 (2003), 7794.CrossRefGoogle Scholar
[9]Farkas, H.M. and Kra, I., Theta constants, Riemann surfaces and the modular group, Graduate Studies in Mathematics 37 (Amer. Math. Soc., Providence, RI, 2001).Google Scholar
[10]Fine, N.J., Basic hypergeometric series and applications, Mathematical Surveys and Monographs 27 (American Mathematical Society, Providence, RI, 1988).CrossRefGoogle Scholar
[11]Garvan, F., ‘Cubic modular identities of Ramanujan, hypergeometric functions and ana-logues of the arithmetic-geometric mean iteration’, Contemp. Math. 166 (1994), 245264.CrossRefGoogle Scholar
[12]Hirschhorn, M., Garvan, F. and Borwein, J., ‘Cubic analogues of the Jacobian theta functions θ(z, q)’, Canad. J. Math. 45 (1993), 673694.CrossRefGoogle Scholar
[13]Hirschhorn, M., ‘Three classical results on representations of a number’, Sém. Lothar. Combin. 42 (1999). Art. B42f, 8 pp. (electronic).Google Scholar
[14]Liu, Z-G., ‘Some Eisenstein series identities associated with the Borwein functions’, Dev. Math. 4 (2001), 147169.Google Scholar
[15]Ramanujan, S., ‘On certain arithmetical functions’, Trans. Camb. Phil. Soc. 22 (1916), 159184. Reprinted in [17, 136–162].Google Scholar
[16]Ramanujan, S., Notebooks, (2 volumes) (Tata Institute of Fundamental Research, Bombay, 1957).Google Scholar
[17]Ramanujan, S., Collected papers (AMS Chelsea Publishing, Providence, RI, 2000).Google Scholar
[18]Solé, P., ‘D 4, E 6, E 8 and the AGM’, in Applied algebra, algebraic algorithms and error-correcting codes (Paris, 1995), Lecture Notes in Computer Science 948 (Springer, Berlin, 1995), pp. 448455.CrossRefGoogle Scholar