You are cordially invited to our next Lecture on Thursday,
July 5th, at 14:15 h at FU Berlin. Speaker: Akihiro Higashitani (Kyoto Sangyo University) Title: Finding a new universal condition in Ehrhart
theory Time: THURSDAY, July 5th - 14:15 h Location: Freie Universität Berlin Institut für Mathematik Arnimallee 2 14195 Berlin Abstract: Recently, Balletti and I proved that for the h^*-polynomial h_0^*+h_1^*t+... of a lattice polytope, if we assume h_3^*=0, then (h_1^*, h_2^*) satisfies (i) h_2^*=0; or (ii) h_1^* \leq 3h_2^* + 3; or (iii) (h_1^*,h_2^*)=(7,1). These conditions derive from Scott's theorem (1976), who characterized the possible h^*-polynomials of 2-dimensional lattice polytopes, and Scott's theorem is also essentially valid for lattice polytopes with degree at most 2 (Treutlein (2010)). On the other hand, we proved that it also holds under the assumption h_3^*=0. Since the assumption h_3^*=0 is independent of both dimension and degree of polytopes, we call the conditions (i), (ii), (iii) universal. In this talk, towards finding a new universal condition, we investigate the possibility for the polynomial h_0^*+h_1^*t+... to be the h^*-polynomial of some lattice polytope under the assumption that some of h_i^*'s vanish. Exceptionally, this talk will be on Thursday. -- Graduiertenkolleg 'Facets of Complexity' www.facetsofcomplexity.de/monday |