Abstract
FFLV polytopes describe monomial bases in irreducible representations of sln and sp2 n. We study various sets of vertices of FFLV polytopes. First, we consider the special linear case. We prove the locality of the set of vertices with respect to the type A Dynkin diagram. Then we describe all the permutation vertices and after that we describe all the simple vertices and prove that their number is equal to the large Schröder number. Finally, we derive analogous results for symplectic Lie algebras.
Original language | English |
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Pages (from-to) | 1083-1110 |
Number of pages | 28 |
Journal | Journal of Algebraic Combinatorics |
Volume | 45 |
Issue number | 4 |
DOIs | |
State | Published - 1 Jun 2017 |
Externally published | Yes |
Keywords
- Convex lattice polytopes
- Degenerate flag varieties
- FFLV polytopes
- Monomial bases
- PBW degenerations
- Poset polytopes
- Representations of semisimple Lie algebras
- Vertex enumeration