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Computational Aspects of Modular Forms and Galois RepresentationsHow One Can Compute in Polynomial Time the Value of Ramanujan's Tau at a Prime (AM-176)$
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Bas Edixhoven and Jean-Marc Couveignes

Print publication date: 2011

Print ISBN-13: 9780691142012

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691142012.001.0001

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Computing coefficients of modular forms

Computing coefficients of modular forms

Chapter:
(p.383) Chapter Fifteen Computing coefficients of modular forms
Source:
Computational Aspects of Modular Forms and Galois Representations
Author(s):

Bas Edixhoven

Publisher:
Princeton University Press
DOI:10.23943/princeton/9780691142012.003.0015

This chapter applies the main result on the computation of Galois representations attached to modular forms of level one to the computation of coefficients of modular forms. It treats the case of the discriminant modular form, that is, the computation of Ramanujan's tau-function at primes, and then deals with the more general case of forms of level one and arbitrary weight k, reformulated as the computation of Hecke operators Tⁿ as ℤ-linear combinations of the Tᵢ with i < k = 12. The chapter gives an application to theta functions of even, unimodular positive definite quadratic forms over ℤ.

Keywords:   modular forms, Galois representations, coefficients, Ramanujan's tau-function, Hecke operators

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