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On Whitney numbers of the Order Ideals of Generalized Fences and Crowns

Research paper by Alessandro Conflitti

Indexed on: 17 Jun '05Published on: 17 Jun '05Published in: Mathematics - Combinatorics



Abstract

We solve some recurrences given by E. Munarini and N. Zagaglia Salvi proving explicit closed formulas for Whitney numbers of the distributive lattices of order ideals of the fence poset and crown poset. Moreover, we get explicit closed formulas for Whitney numbers of lattices of order ideals of fences with higher asymmetric peaks.