Cluster algebras of type $$D_4$$D4, tropical planes, and the positive tropical Grassmannian
Cluster algebras of type $$D_4$$D4, tropical planes, and the positive tropical Grassmannian
复制标题
$$D_4$$D4 类型的簇代数、热带平面和正热带格拉斯曼
DOI:
10.1007/s13366-016-0316-4
复制
发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Jean
中科院分区:
文献类型:
--
作者:
Sarah B. Brodsky;Cesar Ceballos;Jean
We show that the number of combinatorial types of clusters of type $$D_4$$D4 modulo reflection-rotation is exactly equal to the number of combinatorial types of generic tropical planes in $$\mathbb {TP}^5$$TP5. This follows from a result of Sturmfels and Speyer which classifies these generic tropical planes into seven combinatorial classes using a detailed study of the tropical Grassmannian $${{\mathrm{Gr}}}(3,6)$$Gr(3,6). Speyer and Williams show that the positive part $${{\mathrm{Gr}}}^+(3,6)$$Gr+(3,6) of this tropical Grassmannian is combinatorially equivalent to a small coarsening of the cluster fan of type $$D_4$$D4. We provide a structural bijection between the rays of $${{\mathrm{Gr}}}^+(3,6)$$Gr+(3,6) and the almost positive roots of type $$D_4$$D4 which makes this connection more precise. This bijection allows us to use the pseudotriangulations model of the cluster algebra of type $$D_4$$D4 to describe the equivalence of “positive” generic tropical planes in $$\mathbb {TP}^5$$TP5, giving a combinatorial model which characterizes the combinatorial types of generic tropical planes using automorphisms of pseudotriangulations of the octogon.
影响因子:
0.8
作者:
Cesar Ceballos;Jean-Philippe Labbé;Christian Stump
通讯作者:
Christian Stump
DOI:
10.1090/s0002-9947-2014-06239-9
发表时间:
2013-01
期刊:
Discrete Mathematics & Theoretical Computer Science
影响因子:
--
作者:
Cesar Ceballos;Vincent Pilaud
通讯作者:
Cesar Ceballos;Vincent Pilaud