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- W2009462952 abstract "Let k be an algebraically closed field of characteristic p > 0 and C a connected nonsingular projective curve over k with genus g ≥ 2. This paper continues the work begun in [LM05], namely the study of big actions, that is, pairs (C, G) where G is a p-subgroup of the k-automorphism group of C such that |G| > 2 p p−1 g. If G2 denotes the second ramification group of G at the unique ramification point of the cover C → C/G, we display necessary conditions on G2 for (C, G) to be a big action, which allows us to pursue the classification of big actions. Our main source of examples comes from the construction of curves with many rational points using ray class field theory for global function fields, as initiated by J-P. Serre and continued by Lauter ([Lau99]) and by Auer ([Au99]). In particular, we obtain explicit examples of big actions with G2 abelian of large exponent." @default.
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- W2009462952 date "2008-11-23" @default.
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- W2009462952 title "Smooth curves having a large automorphismp-group in characteristicp >0" @default.
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- W2009462952 doi "https://doi.org/10.2140/ant.2008.2.887" @default.
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