2 papers
math.CO2003
Freely braided elements in Coxeter groups, II
R. M. Green, J. Losonczy
We continue the study of freely braided elements of simply laced Coxeter groups, which we introduced in a previous work (math.CO/0301104). A known upper bound for the number of com…
math.CO2003
On rank functions for heaps
R. M. Green
Motivated by work of Stembridge, we study rank functions for Viennot's heaps of pieces. We produce a simple and sufficient criterion for a heap to be a ranked poset and apply the r…