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A Note on Stable Toric Sheaves of Low Rank

  • Carl Tipler

摘要

Kaneyama and Klyachko have shown that any torus equivariant vector bundle of rank r over \(\mathbb {C}\mathbb {P}^n\) C P n splits if \(r < n\) r < n . In particular, any such bundle is not slope stable. In contrast, we provide explicit examples of stable equivariant reflexive sheaves of rank r on any polarised toric variety (XL), for \(2\le r< \textrm{dim}(X)+\textrm{rank}(\textrm{Pic}(X))\) 2 r < dim ( X ) + rank ( Pic ( X ) ) , and show that the dimension of their singular locus is strictly bounded by \(n-r\) n - r .