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arXiv 0909.1931math.COmath.AC
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Buchsbaum* 络合物

Buchsbaum* complexes

Christos A. Athanasiadis, Volkmar Welker

摘要:

引入了域上的一类单纯复形,我们称之为Buchsbaum*. Buchsbaum* 复形推广了可定向同调流形的三角剖分以及双Cohen-Macaulay复形。根据定义,Buchsbaum* 性质只依赖于几何实现和场。给出了单上同调和局部上同调的刻画。证明了Buchsbaum* 复形是双重Buchsbaum复形.研究了Buchsbaum* 复形的计数性质和图论性质。结果表明,各种建设,其中一个推广凸耳分解,产量Buchsbaum* 单纯复形。

英文摘要:

A class of simplicial complexes, which we call Buchsbaum* over a field, is introduced. Buchsbaum* complexes generalize triangulations of orientable homology manifolds as well as doubly Cohen-Macaulay complexes. By definition, the Buchsbaum* property depends only on the geometric realization and the field. Characterizations in terms of simplicial and local cohomology are given. It is proved that Buchsbaum* complexes are doubly Buchsbaum. Enumerative and graph theoretic properties of Buchsbaum* complexes are investigated. It is shown that various constructions, among them one which generalizes convex ear decompositions, yield Buchsbaum* simplicial complexes.

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