Modular representations on some Riemann-Roch spaces of modular curves X(N)

Details Modular representations on some Riemann-Roch spaces of modular curves X(N) Modular representations on some Riemann-Roch spaces of modular curves X(N)

2005-02-28

arxiv.org/abs/math/0502586v1

Mathematics

Algebraic Geometry

49 pages, talk given at AMS Atlanta Algorithmic Algebraic Geometry seesion

Scientific paper

We compute the PSL(2,N)-module structure of the Riemann-Roch space L(D), where D is an invariant non-special divisor on the modular curve X(N), with N > 5 prime. This depends on a computation of the ramification module, which we give explicitly. These results hold for characteristic p if X(N) has good reduction mod p and p does not divide the order of PSL(2,N). We give as examples the cases N=7, 11, which were also computed using GAP. Applications to AG codes associated to this curve are considered, and specific examples are computed using GAP and MAGMA.

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