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Computing weight modular forms of level
Authors:Ariel Pacetti  Fernando Rodriguez Villegas  with an appendix by B Gross
Institution:Department of Mathematics, University of Texas at Austin, Texas 78712 ; Department of Mathematics, University of Texas at Austin, Texas 78712 ; Department of Mathematics, Harvard University, Cambridge, Massacusetts 02138
Abstract:For a prime $p$ we describe an algorithm for computing the Brandt matrices giving the action of the Hecke operators on the space $V$ of modular forms of weight $2$ and level $p^2$. For $p \equiv 3 \bmod 4$ we define a special Hecke stable subspace $V_0$ of $V$ which contains the space of modular forms with CM by the ring of integers of $\mathbb Q(\sqrt{-p})$ and we describe the calculation of the corresponding Brandt matrices.

Keywords:
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