Locally Oriented Noncrossing Trees

[摘要] We define an orientation on the edges of a noncrossing tree induced by the labels: for a noncrossing tree (i.e., the edges do not cross) with vertices $1,2,\ldots,n$ arranged on a circle in this order, all edges are oriented towards the vertex whose label

[学科分类] 离散数学和组合数学

[关键词] Noncrossing trees;local orientation;indegree and outdegree sequence