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arxiv: 1510.02839 · v1 · pith:TL7GPE6Vnew · submitted 2015-10-09 · 🧮 math.NT

Period and index for higher genus curves

classification 🧮 math.NT
keywords indexperiodcurvedegreesfieldgenusgivenrational
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Given a curve $C$ over a field $K$, the period of $C/K$ is the gcd of degrees of $K$-rational divisor classes, while the index is the gcd of degrees of $K$-rational divisors. S. Lichtenbaum showed that the period and index must satisfy certain divisibility conditions. For given admissible period, index, and genus, we show that there exists a curve $C$ and a number field $K$ with these desired invariants, as long as the index is not divisible by $4$.

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