Contraction and restriction of positroids in terms of decorated permutations
classification
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decoratedpermutationscontractionpositroidsrestrictiontermsbijectioncells
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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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