2 papers
math.CO2004
Schubert varieties and free braidedness
R. M. Green, J. Losonczy
We give a simple necessary and sufficient condition for a Schubert variety to be smooth when is a freely braided element of a simply laced Weyl group; such elements were…
math.CO2003
Acyclic heaps of pieces, I
R. M. Green
Heaps of pieces were introduced by Viennot and have applications to algebraic combinatorics, theoretical computer science and statistical physics. In this paper, we how certain com…