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Inequalities for f-vectors of Lattice Polytopes
Department of Mathematics, San Francisco State University, San Francisco, CA 94132, USA.
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematics of Data and AI.ORCID iD: 0000-0002-7931-8243
Department of Mathematics, UC Berkeley, Berkeley, CA 94720, USA.
Department of Combinatorics and Optimization, University of Waterloo, Waterloo, ON, Canada.
2023 (English)In: Seminaire Lotharingien de Combinatoire, E-ISSN 1286-4889, no 89B, article id #43Article in journal (Refereed) Published
Abstract [en]

The Ehrhart polynomial ehrP(n) of a lattice polytope P counts the number of integer points in the n-th dilate of P. The f∗-vector of P, introduced by Felix Breuer in 2012, is the vector of coefficients of ehrP(n) with respect to the binomial coefficient basis (Formula presented.), where d = dimP. Similarly to h/h∗-vectors, the f∗-vector of P coincides with the f-vector of its unimodular triangulations (if they exist). We present several inequalities that hold among the coefficients of f∗-vectors of polytopes. These inequalities resemble striking similarities with existing inequalities for the coefficients of f-vectors of simplicial polytopes; e.g., the first half of the f∗-coefficients increases and the last quarter decreases. Even though f∗-vectors of polytopes are not always unimodal, there are several families of polytopes that carry the unimodality property. We also show that for any polytope with a given Ehrhart h∗-vector, there is a polytope with the same h∗-vector whose f∗-vector is unimodal.

Place, publisher, year, edition, pages
Universitat Wien, Fakultat fur Mathematik , 2023. no 89B, article id #43
Keywords [en]
Ehrhart polynomial, f -vector ∗, Gorenstein polytope, h vector ∗, Lattice polytope, unimodality
National Category
Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-343680Scopus ID: 2-s2.0-85184502746OAI: oai:DiVA.org:kth-343680DiVA, id: diva2:1839873
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QC 20240223

Available from: 2024-02-22 Created: 2024-02-22 Last updated: 2025-03-27Bibliographically approved

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Deligeorgaki, Danai

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