Results 1 to 10 of about 26,527 (250)
A Combinatorial Approach to Multiplicity-Free Richardson Subvarieties of the Grassmannian [PDF]
Discrete Mathematics & Theoretical Computer Science, 2009 We consider Buch's rule for K-theory of the Grassmannian, in the Schur multiplicity-free cases classified by Stembridge. Using a result of Knutson, one sees that Buch's coefficients are related to Möbius inversion. We give a direct combinatorial proof of
Michelle Snider
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Spread Spectrum Modulation with Grassmannian Constellations for Mobile Multiple Access Underwater Acoustic Channels [PDF]
Sensors, 2022 The objective of this study is to evaluate Grassmannian constellations combined with a spread spectrum multiple access scheme for underwater acoustic mobile multiple access communication systems.
Christophe Bernard +2 more
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ABJM amplitudes and the positive orthogonal Grassmannian [PDF]
Journal of High Energy Physics, 2014 A remarkable connection between perturbative scattering amplitudes of four-dimensional planar SYM, and the stratification of the positive grassmannian, was revealed in the seminal work of Arkani-Hamed et. al.
Yu-Tin Huang, Congkao Wen
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Orbit Structure of Grassmannian G2,m and a Decoder for Grassmann Code C(2, m). [PDF]
IEEE Trans Inf Theory, 2023 Piñero FL, Singh P.
europepmc +3 more sources
The Yangian origin of the Grassmannian integral [PDF]
Journal of High Energy Physics, 2010 In this paper we analyse formulas which reproduce different contributions to scattering amplitudes in N=4 super Yang-Mills theory through a Grassmannian integral. Recently their Yangian invariance has been proved directly by using the explicit expression
A Brandhuber +48 more
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Projectivity of the Witt vector affine Grassmannian [PDF]
Inventiones Mathematicae, 2016 Bhargav Bhatt, Peter Scholze
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Network parameterizations for the Grassmannian [PDF]
Discrete Mathematics & Theoretical Computer Science, 2013 Deodhar introduced his decomposition of partial flag varieties as a tool for understanding Kazhdan-Lusztig polynomials. The Deodhar decomposition of the Grassmannian is also useful in the context of soliton solutions to the KP equation, as shown by ...
Kelli Talaska, Lauren Williams
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Combinatorics of diagrams of permutations [PDF]
Discrete Mathematics & Theoretical Computer Science, 2014 There are numerous combinatorial objects associated to a Grassmannian permutation $w_λ$ that index cells of the totally nonnegative Grassmannian. We study some of these objects (rook placements, acyclic orientations, various restricted fillings) and ...
Joel Brewster Lewis, Alejandro Morales
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Non-planar BCFW Grassmannian geometries
Journal of High Energy Physics, 2022 In this paper, we study non-adjacent BCFW recursion relations and their connection to positive geometry. For an adjacent BCFW shift, the n-point N k MHV tree-level amplitude in N $$ \mathcal{N} $$ = 4 SYM theory is expressed as a sum over planar on-shell
Shruti Paranjape +2 more
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Total positivity for the Lagrangian Grassmannian [PDF]
Discrete Mathematics & Theoretical Computer Science, 2020 The positroid decomposition of the Grassmannian refines the well-known Schubert decomposition, and has a rich combinatorial structure. There are a number of interesting combinatorial posets which index positroid varieties,just as Young diagrams index ...
Rachel Karpman
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