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Inequalities for f-vectors of Lattice Polytopes
Department of Mathematics, San Francisco State University, San Francisco, CA 94132, USA.
KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik för Data och 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 (Engelska)Ingår i: Seminaire Lotharingien de Combinatoire, E-ISSN 1286-4889, nr 89B, artikel-id #43Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Universitat Wien, Fakultat fur Mathematik , 2023. nr 89B, artikel-id #43
Nyckelord [en]
Ehrhart polynomial, f -vector ∗, Gorenstein polytope, h vector ∗, Lattice polytope, unimodality
Nationell ämneskategori
Matematik
Identifikatorer
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

Tillgänglig från: 2024-02-22 Skapad: 2024-02-22 Senast uppdaterad: 2025-03-27Bibliografiskt granskad

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Deligeorgaki, Danai

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