Shellability of face posets of electrical networks and the CW poset property
Shellability of face posets of electrical networks and the CW poset property
复制标题
电网面偏序集的可壳性和 CW 偏序集性质
DOI:
10.1016/j.aam.2021.102178
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发表时间:
2021
影响因子:
1.1
通讯作者:
Kenyon, Richard
中科院分区:
文献类型:
--
作者:
Hersh, Patricia;Kenyon, Richard
We prove a conjecture of Thomas Lam that the face posets of stratified spaces of planar resistor networks are shellable. These posets are called uncrossing partial orders. This shellability result combines with Lam's previous result that these same posets are Eulerian to imply that they are CW posets, namely that they are face posets of regular CW complexes. Certain subposets of uncrossing partial orders are shown to be isomorphic to type A Bruhat order intervals; our shelling is shown to coincide on these intervals with a Bruhat order shelling which was constructed by Matthew Dyer using a reflection order.Our shelling for uncrossing posets also yields an explicit shelling for each interval in the face posets of the edge product spaces of phylogenetic trees, namely in the Tuffley posets, by virtue of each interval in a Tuffley poset being isomorphic to an interval in an uncrossing poset. This yields a more explicit proof of the result of Gill, Linusson, Moulton and Steel that the CW decomposition of Moulton and Steel for the edge product space of phylogenetic trees is a regular CW decomposition.
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影响因子:
1.7
作者:
Galashin, Pavel;Karp, Steven N.;Lam, Thomas
通讯作者:
Lam, Thomas
DOI:
--
发表时间:
1982
期刊:
影响因子:
--
作者:
A. Björner;M. Wachs
通讯作者:
M. Wachs
DOI:
10.1016/s0195-6698(84)80012-8
发表时间:
1984
期刊:
Eur. J. Comb.
影响因子:
--
作者:
A. Björner
通讯作者:
A. Björner
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
P. Hersh
通讯作者:
P. Hersh
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
R. Kenyon
通讯作者:
R. Kenyon