关于下Eulerian Cohen-Macaulay偏序集的Mobius函数
On the Mobius function of a lower Eulerian Cohen-Macaulay poset
摘要:
证明了一个不等式对于在下Eulerian Cohen-Macaulay偏序集上附加最大元得到的偏序集的Mobius函数的值成立。在两个重要的特殊情况下,这个不等式提供了部分结果,支持Stanley关于下Eulerian Cohen-Macaulay交半格的环面h-向量的非负性猜想和Adin关于Cohen-Macaulay三次复形的三次h-向量的非负性猜想。
英文摘要:
A certain inequality is shown to hold for the values of the Mobius function of the poset obtained by attaching a maximum element to a lower Eulerian Cohen-Macaulay poset. In two important special cases, this inequality provides partial results supporting Stanley's nonnegativity conjecture for the toric h-vector of a lower Eulerian Cohen-Macaulay meet-semilattice and Adin's nonnegativity conjecture for the cubical h-vector of a Cohen-Macaulay cubical complex.
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