Purity and Separation for Oriented Matroids J. Kevin Thompson It combines theoretical perspective with

It combines theoretical perspective with tangible action plans and walks you step-by-step through designing

Childhood and Youth

Holstein take up a new

Starting in the 1960s

Purity and Separation for Oriented Matroids J. Kevin Thompson It combines theoretical perspective withLeclerc and Zelevinsky, motivated by the study of quasi commuting quantum flag minors, introduced the notions of strongly separated and weakly separated collections. These notions are closely related to the theory of cluster algebras, to the combinatorics of the double Bruhat cells, and to the totally positive Grassmannian. A key feature, called the purity phenomenon, is that every maximal by inclusion strongly (resp., weakly) separated collection of