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arXiv math/0311430math.CO
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关于集合套复形的拓扑

On the topology of nested set complexes

Eva Maria Feichtner, Irene Mueller

摘要:

嵌套集合复形是De Concini-Procesi排列模型的组合核心。证明了套集复形同伦等价于不含极小元的交半格的序复形。对于原子半格,我们考虑了第一作者和S。尤兹文斯基我们表明,在这种情况下,套复形实际上是同胚的顺序所提到的复形。

英文摘要:

Nested set complexes appear as the combinatorial core of De Concini-Procesi arrangement models. We show that nested set complexes are homotopy equivalent to the order complexes of the underlying meet-semilattices without their minimal elements. For atomic semilattices, we consider the realization of nested set complexes by simplicial fans as proposed in math.AG/0305142 by the first author and S. Yuzvinsky. We show that in this case the nested set complexes in fact are homeomorphic to the mentioned order complexes.

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