Semistable vector bundles and Tannaka duality from a computational point of view

Details Semistable vector bundles and Tannaka duality from a computational point of view Semistable vector bundles and Tannaka duality from a computational point of view

2011-02-17

arxiv.org/abs/1102.3637v2

Mathematics

Algebraic Geometry

34 pages

Scientific paper

We develop a semistability algorithm for vector bundles which are given as a kernel of a surjective morphism between splitting bundles on the projective space over an algebraically closed field K. This class of bundles is a generalization of syzygy bundles. We show how to implement this algorithm in a computer algebra system. Further we give applications, mainly concerning the computation of Tannaka dual groups of stable vector bundles of degree 0 on the projective space and on certain smooth complete intersection curves. We also use our algorithm to close an open case left in a recent work of L. Costa, P. Macias Marques and R. M. Miro-Roig regarding the stability of the syzygy bundle of general forms. Finally, we apply our algorithm to provide a computational approach to tight closure. All algorithms are implemented in the computer algebra system CoCoA.

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