Fibre products of Kummer covers and curves with many points
✍ Scribed by Ferruh Özbudak; Burcu Gülmez Temur
- Publisher
- Springer
- Year
- 2007
- Tongue
- English
- Weight
- 158 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0938-1279
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We establish a correspondence between a class of Kummer extensions of the rational function "eld and con"gurations of hyperplanes in an a$ne space. Using this correspondence, we obtain explicit curves over "nite "elds with many rational points. Some of our examples almost attain the OesterleH bound.
Let N q g denote the maximal number of F q -rational points on any curve of genus g over F q . Ihara (for square q) and Serre (for general q) proved that lim sup g→∞ N q g /g > 0 for any fixed q. Here we prove lim g→∞ N q g = ∞. More precisely, we use abelian covers of P 1 to prove lim inf g→∞ N q g
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