A stacky approach to identifying the semistable locus of bundles
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classification
math.AG
keywords
modulibundlesopenadmitslocusmaximalranksemistable
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We show that the semistable locus is the unique maximal open substack of the moduli stack of principal bundles over a curve that admits a schematic moduli space. For rank $2$ vector bundles it coincides with the unique maximal open substack that admits a separated moduli space, but for higher rank there exist other open substacks that admit separated moduli spaces.
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