Alexander duality for monomial ideals associated with isotone maps between posets

Alexander duality for monomial ideals associated with isotone maps between posets
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与偏序集之间等调图相关的单项式理想的亚历山大对偶性

DOI:
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
Akihiro Shikama
Akihiro Shikama
中科院分区:
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文献类型:
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作者:
J. Herzog;A. Qureshi;Akihiro Shikama

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对于有限偏置对$(P,Q)$,理想$L(P,Q)$的生成元客观地对应于$P$到$Q$的等音映射。在这篇笔记中,我们确定了所有对$(P,Q)$,其中$L(P,Q)$的亚历山大对偶与$L(Q,P)$重合的$L(P, P)$,直到指标的交换。
For a pair $(P,Q)$ of finite posets the generators of the ideal $L(P,Q)$ correspond bijectively to the isotone maps from $P$ to $Q$. In this note we determine all pairs $(P,Q)$ for which the Alexander dual of $L(P,Q)$ coincides with $L(Q,P)$, up to a switch of the indices.