Generating spaces of modular forms with $\eta$-quotients

Abstract

In this note we consider a question of Ono, concerning which spaces of classical modular forms can be generated by sums of $\eta$-quotients. We give some new examples of spaces of modular forms which can be generated as sums of $\eta$-quotients, and show that we can write all modular forms of level ${\Gamma }_0(N)$ as rational functions of $\eta$-products.

9 pages

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