The diameter of type D associahedra and the non-leaving-face property
The diameter of type D associahedra and the non-leaving-face property
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D型联面体的直径与不离面性质
DOI:
10.1016/j.ejc.2015.04.006
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Vincent Pilaud
中科院分区:
文献类型:
--
作者:
Cesar Ceballos;Vincent Pilaud
Generalized associahedra were introduced by S. Fomin and A. Zelevinsky in connection to finite type cluster algebras. Following recent work of L. Pournin in types A and B, this paper focuses on geodesic properties of generalized associahedra. We prove that the graph diameter of the n-dimensional associahedron of type D is precisely 2 n− 2 for all n greater than 1. Furthermore, we show that all type B C D associahedra have the non-leaving-face property, that is, any geodesic connecting two vertices in the graph of the polytope stays in the minimal face containing both. This property was already proven by D. Sleator, R. Tarjan and W. Thurston for associahedra of type A. In contrast, we present relevant examples related to the associahedron that do not always satisfy this property.
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DOI:
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发表时间:
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期刊:
影响因子:
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DOI:
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Math. Oper. Res.
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