Download or read book Purity and Separation for Oriented Matroids written by Pavel Galashin and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Leclerc 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 subsets in [n] has the same cardinality. In this paper, we extend these notions and define M-separated collections for any oriented matroid M. We show that maximal by size M-separated collections are in bijection with fine zonotopal tilings (if M is a realizable oriented matroid), or with one-element liftings of M in general position (for an arbitrary oriented matroid). We introduce the class of pure oriented matroids for which the purity phenomenon holds: an oriented matroid M is pure if M-separated collections form a pure simplicial complex, i.e., any maximal by inclusion M-separated collection is also maximal by size. We pay closer attention to several special classes of oriented matroids: oriented matroids of rank 3, graphical oriented matroids, and uniform oriented matroids. We classify pure oriented matroids in these cases. An oriented matroid of rank 3 is pure if and only if it is a positroid (up to reorienting and relabeling its ground set). A graphical oriented matroid is pure if and only if its underlying graph is an outerplanar graph, that is, a subgraph of a triangulation of an n-gon. We give a simple conjectural characterization of pure oriented matroids by forbidden minors and prove it for the above classes of matroids (rank 3, graphical, uniform).

Download or read book Purity and Separation for Oriented Matroids written by Pavel Galashin and published by American Mathematical Society. This book was released on 2023-09-27 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: View the abstract.

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Download or read book Potential Estimates and Quasilinear Parabolic Equations with Measure Data written by Quoc-Hung Nguyen and published by American Mathematical Society. This book was released on 2024-01-19 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: View the abstract.

Download or read book On the Boundary Behavior of Mass Minimizing Integral Currents written by Camillo De Lellis and published by American Mathematical Society. This book was released on 2024-01-17 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: View the abstract.

Download or read book Total Positivity is a Quantum Phenomenon The Grassmannian Case written by S. Launois and published by American Mathematical Society. This book was released on 2024-01-19 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: View the abstract.

Download or read book Global Existence of Small Amplitude Solutions for a Model Quadratic Quasilinear Coupled Wave Klein Gordon System in Two Space Dimension with Mildly Decaying Cauchy Data written by A. Stingo and published by American Mathematical Society. This book was released on 2023-11-27 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: View the abstract.

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Download or read book Tate Duality in Positive Dimension over Function Fields written by Zev Rosengarten and published by American Mathematical Society. This book was released on 2023-11-27 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: View the abstract.