The Waldschmidt constant for squarefree monomial ideals
The Waldschmidt constant for squarefree monomial ideals
复制标题
无平方单项式理想的 Waldschmidt 常数
DOI:
10.1007/s10801-016-0693-7
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发表时间:
2016
影响因子:
0.8
通讯作者:
Vu, Thanh
中科院分区:
文献类型:
--
作者:
Bocci, Cristiano;Cooper, Susan;Guardo, Elena;Harbourne, Brian;Janssen, Mike;Nagel, Uwe;Seceleanu, Alexandra;Tuyl, Adam Van;Vu, Thanh
Given a squarefree monomial ideal, we show that, the Waldschmidt constant ofI, can be expressed as the optimal solution to a linear program constructed from the primary decomposition ofI. By applying results from fractional graph theory, we can then expressin terms of the fractional chromatic number of a hypergraph also constructed from the primary decomposition ofI. Moreover, expressingas the solution to a linear program enables us to prove a Chudnovsky-like lower bound on, thus verifying a conjecture of Cooper–Embree–Hà–Hoefel for monomial ideals in the squarefree case. As an application, we compute the Waldschmidt constant and the resurgence for some families of squarefree monomial ideals. For example, we determine both constants for unions of general linear subspaces ofwith few components compared ton, and we compute the Waldschmidt constant for the Stanley–Reisner ideal of a uniform matroid.
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DOI:
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发表时间:
2012
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影响因子:
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发表时间:
2015
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2015
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发表时间:
2003
期刊:
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