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arXiv 1102.3637math.AGmath.AC
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从计算观点看半稳定向量丛和Tannaka对偶

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

Almar Kaid, Ralf Kasprowitz

摘要:

本文给出了一个求解向量丛的半稳定性算法,其中向量丛是代数闭域K上射影空间上分裂丛之间满射的核。这类丛是合合丛的推广。我们将展示如何在计算机代数系统中实现该算法。在此基础上,我们给出了一些应用,主要是关于射影空间上和某些光滑完备交曲线上0次稳定向量丛的Tannaka对偶群的计算.我们还使用我们的算法关闭一个开放的情况下,在最近的工作L。Costa,P. Macias Marques和R. M. Miro-Roig关于一般形式的合冲丛的稳定性。最后,我们应用我们的算法提供了一个计算方法,紧封闭。所有算法都在计算机代数系统CoCoA中实现。

英文摘要:

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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