
arXiv: 0708.2632
A wealth of geometric and combinatorial properties of a given linear endomorphism $X$ of $\R^N$ is captured in the study of its associated zonotope $Z(X)$, and, by duality, its associated hyperplane arrangement ${\cal H}(X)$. This well-known line of study is particularly interesting in case $n\eqbd\rank X \ll N$. We enhance this study to an algebraic level, and associate $X$ with three algebraic structures, referred herein as {\it external, central, and internal.} Each algebraic structure is given in terms of a pair of homogeneous polynomial ideals in $n$ variables that are dual to each other: one encodes properties of the arrangement ${\cal H}(X)$, while the other encodes by duality properties of the zonotope $Z(X)$. The algebraic structures are defined purely in terms of the combinatorial structure of $X$, but are subsequently proved to be equally obtainable by applying suitable algebro-analytic operations to either of $Z(X)$ or ${\cal H}(X)$. The theory is universal in the sense that it requires no assumptions on the map $X$ (the only exception being that the algebro-analytic operations on $Z(X)$ yield sought-for results only in case $X$ is unimodular), and provides new tools that can be used in enumerative combinatorics, graph theory, representation theory, polytope geometry, and approximation theory.
44 pages; updated to reflect referees' remarks and the developments in the area since the article first appeared on the arXiv
Kernels of differential operators, Mathematics(all), zonotopes, Multidimensional problems, Polynomial ideals, Commutative Algebra (math.AC), Polynomial interpolation, Zonotopes, Classical Analysis and ODEs (math.CA), parking functions, multivariate polynomials, graphs, Graphs and linear algebra (matrices, eigenvalues, etc.), polynomial ideals, Graded rings, Multivariate polynomials, Matroids, Tutte polynomial, Ehrhart polynomial, Lattice polytopes in convex geometry (including relations with commutative algebra and algebraic geometry), Mathematics - Classical Analysis and ODEs, Special polytopes (linear programming, centrally symmetric, etc.), duality, Combinatorics (math.CO), Graphs, matroids, Hyperplane arrangements, Duality, Hilbert series, box splines, Box splines, FOS: Mathematics, kernels of differential operators, Mathematics - Combinatorics, 13F20, 13A02, 16W50, 16W60, 47F05, 47L20, 05B20, 05B35, 05B45, 05C50, 52B05, 52B12, 52B20, 52C07, 52C35, 41A15, 41A63, General theory of partial differential operators, polynomial interpolation, grading, Mathematics - Commutative Algebra, Arrangements of points, flats, hyperplanes (aspects of discrete geometry), Polynomial rings and ideals; rings of integer-valued polynomials, Operator ideals, Grading, Spline approximation, hyperplane arrangements, Combinatorial aspects of commutative algebra, Parking functions
Kernels of differential operators, Mathematics(all), zonotopes, Multidimensional problems, Polynomial ideals, Commutative Algebra (math.AC), Polynomial interpolation, Zonotopes, Classical Analysis and ODEs (math.CA), parking functions, multivariate polynomials, graphs, Graphs and linear algebra (matrices, eigenvalues, etc.), polynomial ideals, Graded rings, Multivariate polynomials, Matroids, Tutte polynomial, Ehrhart polynomial, Lattice polytopes in convex geometry (including relations with commutative algebra and algebraic geometry), Mathematics - Classical Analysis and ODEs, Special polytopes (linear programming, centrally symmetric, etc.), duality, Combinatorics (math.CO), Graphs, matroids, Hyperplane arrangements, Duality, Hilbert series, box splines, Box splines, FOS: Mathematics, kernels of differential operators, Mathematics - Combinatorics, 13F20, 13A02, 16W50, 16W60, 47F05, 47L20, 05B20, 05B35, 05B45, 05C50, 52B05, 52B12, 52B20, 52C07, 52C35, 41A15, 41A63, General theory of partial differential operators, polynomial interpolation, grading, Mathematics - Commutative Algebra, Arrangements of points, flats, hyperplanes (aspects of discrete geometry), Polynomial rings and ideals; rings of integer-valued polynomials, Operator ideals, Grading, Spline approximation, hyperplane arrangements, Combinatorial aspects of commutative algebra, Parking functions
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