A First Course in Modular Forms
《A First Course in Modular Forms》 · 第 4 页 · Section 1.1「First definitions and examples」
This means that $f$ has a Fourier expansion $f(\tau)=\sum_{n=0}^{\infty}a_nq^n$, $q=e^{2\pi i\tau}$.
A First Course in Modular Forms
《A First Course in Modular Forms》 · 第 4 页 · Section 1.1「First definitions and examples」
This means that $f$ has a Fourier expansion $f(\tau)=\sum_{n=0}^{\infty}a_nq^n$, $q=e^{2\pi i\tau}$.
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