Abstract
In this note we give a direct proof using the theory of modular forms of a beautiful fact explained in the preceding paper by Robbert Dijkgraaf [1, Theorem 2 and Corollary]. Let \( {\tilde M_*}({\Gamma _1}) \) denote the graded ring of quasi-modular forms on the full modular group Γ= PSL(2, ℤ). This is the ring generated by G2, G4, G6, and graded by assigning to each G k the weight where \( {G_k} = - \frac{{{B_k}}}{{2k}} + \sum\limits_{n = 1}^\infty {\left( {{{\sum\limits_{d|n} d }^{k - 1}}} \right)} {q^n}\left( {k \geqslant 2,{B_k} = kth Bernoulli number} \right) \) are the classical Eisenstein series, all of which except G 2 are modular.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
R. Dijkgraaf, Mirror symmetry and elliptic curves, this volume, pp. 149–163
M. Eichler and D. Zagier, “The Theory of Jacobi Forms,” Progress in Math. 55, Birkhauser, Basel-Boston (1985)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1995 Birkhäuser Boston
About this paper
Cite this paper
Kaneko, M., Zagier, D. (1995). A Generalized Jacobi Theta Function and Quasimodular Forms. In: Dijkgraaf, R.H., Faber, C.F., van der Geer, G.B.M. (eds) The Moduli Space of Curves. Progress in Mathematics, vol 129. Birkhäuser Boston. https://doi.org/10.1007/978-1-4612-4264-2_6
Download citation
DOI: https://doi.org/10.1007/978-1-4612-4264-2_6
Publisher Name: Birkhäuser Boston
Print ISBN: 978-1-4612-8714-8
Online ISBN: 978-1-4612-4264-2
eBook Packages: Springer Book Archive