All modular forms of weight 2 can be expressed by Eisenstein series
Martin Raum, Jiacheng Xia
Abstract
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Martin Raum, Jiacheng Xia
Abstract
Open-access reader
We show that every elliptic modular form of integral weight greater than $1$ can be expressed as linear combinations of products of at most two cusp expansions of Eisenstein series. This removes the obstruction of nonvanishing central $\mathrm{L}$-values present in all previous work. For weights greater than $2$, we refine our result further, showing that linear combinations of products of exactly two cusp expansions of Eisenstein series suffice.
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We show that every elliptic modular form of integral weight greater than $1$ can be expressed as linear combinations of products of at most two cusp expansions of Eisenstein series. This removes the obstruction of nonvanishing central $\mathrm{L}$-values present in all previous work. For weights greater than $2$, we refine our result further, showing that linear combinations of products of exactly two cusp expansions of Eisenstein series suffice.
Key concepts: Eisenstein series, Modular form, Cusp (singularity), Cusp form, Mathematics, Series (stratigraphy), Pure mathematics, Modular design