Contraction and restriction of positroids in terms of decorated permutations

Details Contraction and restriction of positroids in terms of decorated permutations Contraction and restriction of positroids in terms of decorated permutations

2008-04-06

arxiv.org/abs/0804.0882v2

Mathematics

Combinatorics

7 pages. v2: Redundant part modified, typos fixed

Scientific paper

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 explain contraction and restriction of
positroids in terms of decorated permutations.

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