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Showing 2003 · math.COShow all
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math.CO2003
Labelled and unlabelled enumeration of -gonal 2-trees
G. Labelle, C. Lamathe, P. Leroux
In this paper, we generalize 2-trees by replacing triangles by quadrilaterals, pentagons or -sided polygons (-gons), where is fixed. This generalization, to -gon…
math.CO2003
Supersolvable LL-lattices of binary trees
Riccardo Biagioli, Frederic Chapoton
Some posets of binary leaf-labeled trees are shown to be supersolvable lattices and explicit EL-labelings are given. Their characteristic polynomials are computed, recovering their…