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Modular curves provide the first known examples of codes which are better than random ones. However, for an explicit construction of a code one needs a nonsingular model of the modular curve that initially is defined via a very singular planar model given by a modular equation. In this work we analyze the structure of its affine singularities in terms of class numbers of binary quadratic forms. In principle this allows to describe the space of regular differentials vanishing at a point needed for the Goppa construction.

Produktbeschreibung
Modular curves provide the first known examples of
codes which are better than random ones. However, for
an explicit construction of a code one needs a
nonsingular model of the modular curve that initially
is defined via a very singular planar model given by
a modular equation. In this work we analyze the
structure of its affine singularities in terms of
class numbers of binary quadratic forms. In
principle this allows to describe the space of
regular differentials vanishing at a point needed for
the Goppa construction.
Autorenporträt
Dr.Orhun Kara received his PhD from Bilkent University in Turkey
in 2003.Currently he has been working as a chief researcher in
TÜB TAK UEKAE.
Professor Alexander Klyachko got his PhD in Saratov State
University (Russia) in 1975. His mathematical interests include
Liegroups,Representation theory, Algebraic Geometry, Modular forms
and Coding Theory.