Stern 偏序集是组合数学中一类非常重要且有趣的偏序集, 在组合计数中起到重要的统一作用.
本篇论文从计数序理想角度出发, 研究了Stern 偏序集的flag f 和flag h 向量 …

In this paper, we consider the combinatorial properties of the hexagonal lattice. Let $ e (n) $
be the number of $ n $-element order ideals in a hexagonal lattice. We give the enumeration …

Let L be a supersolvable lattice with nonzero Möbius function. We show that the order
complex of any rank-selected subposet of L admits a convex-ear decomposition. This proves …