# Mathematics Colloquia and Seminars

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### 'Hollow' Lattice Polytopes

**Algebra & Discrete Mathematics**

Speaker: | Benjamin Nill, MSRI |

Location: | 2112 MSB |

Start time: | Fri, Nov 20 2009, 4:10PM |

In the geometry of numbers one of the main objects of study are lattice-point-free convex bodies. In this talk I will give a survey of conjectures and results on the corresponding objects in the world of lattice polytopes: lattice polytopes without interior lattice points. It turns out that there is a nice invariant in Ehrhart theory, called the codegree, which measures the 'hollowness' of these lattice polytopes. In joint work with Christian Haase and Sam Payne, we could prove a structure theorem on lattice polytopes with large codegree, which yields a new finiteness result on Ehrhart polynomials. If time allows, I will also present related work in progress with Sandra Di Rocco and Christian Haase.