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math.CO2008
Contraction and restriction of positroids in terms of decorated permutations
Suho Oh
A positroid is a matroid defined by Postnikov to study the cells in the non-negative part of the Grassmannian. They are in bijection with decorated permutations. We show a way to e…
math.CO2008★ 5 cited
Positroids and Schubert matroids
Suho Oh
Postnikov gave a combinatorial description of the cells in a totally-nonnegative Grassmannian. These cells correspond to a special class of matroids called positroid. We prove his…