New inequalities for subspace arrangements
New inequalities for subspace arrangements
复制标题
子空间排列的新不等式
DOI:
10.1016/j.jcta.2009.10.014
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
R. Kinser
中科院分区:
文献类型:
--
作者:
R. Kinser
For each positive integer n⩾4, we give an inequality satisfied by rank functions of arrangements of n subspaces. When n=4 we recover Ingleton's inequality; for higher n the inequalities are all new. These inequalities can be thought of as a hierarchy of necessary conditions for a (poly)matroid to be realizable. Some related open questions about the “cone of realizable polymatroids” are also presented.