Dimers, webs, and positroids
Dimers, webs, and positroids
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二聚体、网和正类
DOI:
10.1112/jlms/jdv039
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
T. Lam
中科院分区:
文献类型:
--
作者:
T. Lam
We study the dimer model for a planar bipartite graph N embedded in a disk, with boundary vertices on the boundary of the disk. Counting dimer configurations with specified boundary conditions gives a point in the totally non‐negative Grassmannian. Considering pairing probabilities for the double‐dimer model gives rise to Grassmann analogs of Rhoades and Skandera's Temperley–Lieb immanants. The same problem for the (probably novel) triple‐dimer model gives rise to the combinatorics of Kuperberg's webs and Grassmann analogs of Pylyavskyy's web immanants. This draws a connection between the square move of plabic graphs (or urban renewal of planar bipartite graphs), and Kuperberg's square reduction of webs. Our results also suggest that canonical‐like bases might be applied to the dimer model.
影响因子:
2.4
作者:
Robert J. Marsh;J. Scott
通讯作者:
Robert J. Marsh;J. Scott