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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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Approximating Vf over the complex numbers

Approximating Vf over the complex numbers

(p.257) Chapter Twelve Approximating Vf over the complex numbers
Computational Aspects of Modular Forms and Galois Representations

Jean-Marc Couveignes

Princeton University Press

This chapter addresses the problem of computing torsion divisors on modular curves with an application to the explicit calculation of modular representations. The final result of the chapter is Theorem 12.14.1 (approximating Vsubscript f). It identifies two differences between this Theorem 12.14.1 and Theorem 12.10.7. First, it claims that it can separate the cuspidal and the finite part of Qₓ. Second, it returns algebraic coordinates b and x for the points Qsubscript x,n rather than analytic ones.

Keywords:   modular forms, torsion divisors, modular curves, modular representation

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