Non‐Commutative Coordinate Rings and Stacks
Non‐Commutative Coordinate Rings and Stacks
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非交换坐标环和堆栈
DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
C. Ingalls
中科院分区:
文献类型:
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作者:
D. Chan;C. Ingalls
Let Y ⇉ X be a finite flat groupoid scheme with X a quasi‐projective variety and let S be its coarse moduli scheme. We associate to the groupoid scheme a coherent sheaf of algebras OX/Y on S which we call the non‐commutative coordinate ring of the groupoid scheme. We show that when X is a smooth curve and the groupoid action is generically free, the non‐commutative coordinate rings which can occur are, up to Morita equivalence, the hereditary orders on smooth curves. This gives a bijective correspondence between smooth one‐dimensional Deligne–Mumford stacks of finite type and Morita equivalence classes of hereditary orders on smooth curves. 2000 Mathematics Subject Classification 14A22, 16S38, 14A20.