Search Results - "Speyer, David"

Weak separation and plabic graphs by Oh, Suho, Postnikov, Alexander, Speyer, David E.

“…Leclerc and Zelevinsky described quasicommuting families of quantum minors in terms of a certain combinatorial condition, called weak separation. They…”
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Cohomology of cluster varieties II: Acyclic case by Lam, Thomas, Speyer, David E

“…In the previous work, we initiated the study of the cohomology of locally acyclic cluster varieties. In the present work, we show that the mixed Hodge…”
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The fundamental theorem of finite semidistributive lattices by Reading, Nathan, Speyer, David E, Thomas, Hugh

“…We prove a Fundamental Theorem of Finite Semidistributive Lattices (FTFSDL), modelled on Birkhoff’s Fundamental Theorem of Finite Distributive Lattices. Our…”
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Cluster algebras of Grassmannians are locally acyclic by Muller, Greg, Speyer, David E.

“…Considered as commutative algebras, cluster algebras can be very unpleasant objects. However, the first author introduced a condition known as ``local…”
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Castelnuovo–Mumford regularity of matrix Schubert varieties by Pechenik, Oliver, Speyer, David E, Weigandt, Anna

“…Matrix Schubert varieties are affine varieties arising in the Schubert calculus of the complete flag variety. We give a formula for the Castelnuovo–Mumford…”
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The positive Dressian equals the positive tropical Grassmannian by Speyer, David, Williams, Lauren

“…The Dressian and the tropical Grassmannian parameterize abstract and realizable tropical linear spaces; but in general, the Dressian is much larger than the…”
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Powers of Coxeter Elements in Infinite Groups Are Reduced by Speyer, David E.

“…Let W be an infinite irreducible Coxeter group with (s₁,..., $s_{n}$) the simple generators. We give a short proof that the word $s_{1}s_{2}\cdots…”
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K -classes for matroids and equivariant localization by Fink, Alex, Speyer, David E.

“…To every matroid, we associate a class in the K -theory of the Grassmannian. We study this class by using the method of equivariant localization. In…”
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Variations on a theme of Kasteleyn, with Application to the Totally Nonnegative Grassmannian by Speyer, David E

“…We provide a short proof of a classical result of Kasteleyn, and prove several variants thereof. One of these results has become key in the parametrization of…”
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Sortable elements in infinite Coxeter groups by READING, NATHAN, SPEYER, DAVID E.

“…In a series of previous papers, we studied sortable elements in finite Coxeter groups, and the related Cambrian fans. We applied sortable elements and Cambrian…”
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The growth rate of tri-colored sum-free sets by Kleinberg, Robert, sawin, will, speyer, David

“…The growth rate of tri-colored sum-free sets, Discrete Analysis 2018:12, 10 pp. This paper contributes to the remarkable collection of results that followed in…”
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A Counting Proof of a Theorem of Frobenius by Speyer, David E

“…Frobenius showed that, if m divides the order of a finite group, then the number of m-torsion elements in that group is divisible by m. We provide a quick…”
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Links in the complex of weakly separated collections by Oh, Suho, Speyer, David

“…Plabic graphs are combinatorial objects used to study the totally nonnegative Grassmannian. Faces of plabic graphs are labeled by k-element sets of positive…”
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Schubert problems with respect to osculating flags of stable rational curves by E Speyer, David

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Derivatives of Schubert polynomials and proof of a determinant conjecture of Stanley by Hamaker, Zachary, Pechenik, Oliver, Speyer, David E, Weigandt, Anna

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Cambrian frameworks for cluster algebras of affine type by READING, NATHAN, SPEYER, DAVID E.

“…We give a combinatorial model for the exchange graph and \mathbf {g}-vector fan associated to any acyclic exchange matrix B of affine type. More specifically,…”
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A Cambrian Framework for the Oriented Cycle by Reading, Nathan, Speyer, David E

“…This paper completes the project of constructing combinatorial models (called frameworks) for the exchange graph and $\mathbf{g}$-vector fan associated to any…”
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Perfect matchings and the octahedron recurrence by Speyer, David E.

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The twist for positroids by Muller, Greg, Speyer, David E.

“…There are two reasonable ways to put a cluster structure on a positroid variety. In one, the initial seed is a set of Plu ̈cker coordinates. In the other, the…”
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The twist for positroid varieties by Muller, Greg, Speyer, David E.

“…The purpose of this document is to connect two maps related to certain graphs embedded in the disc. The first is Postnikov's boundary measurement map, which…”
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