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arxiv: 1205.6409 · v2 · pith:QVXQMQHOnew · submitted 2012-05-29 · 🧮 math.AG · math.CV

Curves which cannot be defined over an extension of degree at most two over the field of moduli

classification 🧮 math.AG math.CV
keywords defineddegreeextensionmodulicannotcurvesfieldalgebraic
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It has been conjectured that every algebraic curve may be defined either over its field of moduli or over an extension of degree two of it. In this paper we provide a negative answer to it by giving examples of hyperelliptic curves which cannot be defined over an extension of degree at least two over their fields of moduli.

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