完全正Grassmannian的三角剖分与孤立图
Triangulations and soliton graphs for totally positive Grassmannian
摘要：
KP方程是一个非线性色散波动方程，它为浅水波的共振相互作用提供了一个很好的模型。KP方程的正则孤子解可以由完全非负的Grassmannian Gr $(N,M)_{\geq 0}$中的点构造。Kodama和Williams研究了KP孤子的渐近模式（热带极限），称为孤子图，并表明它们对应于Postnikov的Le图。在本文中，我们考虑孤立子图的KP族，家庭的交换流是兼容的KP方程。对于正的Grassmannian Gr $(2,M)_{>0}$，Kodama和Williams证明了孤子图与$M$ -边形的三角剖分是双射的.当$N=3$和$M=6,7$和$8$同时存在时，我们将这个结果推广到Gr $(N,M)_{>0}$.在每一种情况下，我们表明，孤子图是在双射与Postnikov的plabic图，它推广了乐图。
英文摘要：
The KP equation is a nonlinear dispersive wave equation which provides an excellent model for resonant interactions of shallow-water waves. It is well known that regular soliton solutions of the KP equation may be constructed from points in the totally nonnegative Grassmannian Gr$(N,M)_{\geq 0}$. Kodama and Williams studied the asymptotic patterns (tropical limit) of KP solitons, called soliton graphs, and showed that they correspond to Postnikov's Le-diagrams. In this paper, we consider soliton graphs for the KP hierarchy, a family of commuting flows which are compatible with the KP equation. For the positive Grassmannian Gr$(2,M)_{>0}$, Kodama and Williams showed that soliton graphs are in bijection with triangulations of the $M$-gon. We extend this result to Gr$(N,M)_{>0}$ when $N=3$ and $M=6,7$ and $8$. In each case, we show that soliton graphs are in bijection with Postnikov's plabic graphs, which generalize Le-diagrams.
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