On bundles of rank 3 computing Clifford indices

Details On bundles of rank 3 computing Clifford indices On bundles of rank 3 computing Clifford indices

2012-01-11

arxiv.org/abs/1201.2333v2

Mathematics

Algebraic Geometry

Typos corrected; one additional reference

Scientific paper

Let $C$ be a smooth irreducible projective algebraic curve defined over the complex numbers. The notion of the Clifford index of $C$ was extended a few years ago to semistable bundles of any rank. Recent work has been focussed mainly on the rank-2 Clifford index, although interesting results have also been obtained for the case of rank 3. In this paper we extend this work, obtaining improved lower bounds for the rank-3 Clifford index. This allows the first computations of the rank-3 index in non-trivial cases and examples for which the rank-3 index is greater than the rank-2 index.

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