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arXiv 0904.1683math.ACmath.CO
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Koszul关联代数,仿射半群和Stanley-Reisner理想

Koszul incidence algebras, affine semigroups, and Stanley-Reisner ideals

Victor Reiner, Dumitru I. Stamate

摘要:

本文证明了一个定理,它统一了组合同调代数和交换代数的三个结果,刻画了偏序集和仿射半群环的关联代数的Koszul性质,刻画了无平方单项式理想的线性分解.在分次环境下的刻画是通过某些偏序集或单纯复形的Cohen-Macaulay性质,而在更一般的非分次环境下的刻画是通过序列Cohen-Macaulay性质。

英文摘要:

We prove a theorem unifying three results from combinatorial homological and commutative algebra, characterizing the Koszul property for incidence algebras of posets and affine semigroup rings, and characterizing linear resolutions of squarefree monomial ideals. The characterization in the graded setting is via the Cohen-Macaulay property of certain posets or simplicial complexes, and in the more general nongraded setting, via the sequential Cohen-Macaulay property.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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