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### 1 Introduction

#### 1.1 What is the purpose of the this package?

Normaliz [BIRS14] is a software for computations with rational cones and affine monoids. It pursues two main computational goals: finding the Hilbert basis, a minimal generating system of the monoid of lattice points of a cone; and counting elements degree-wise in a generating function, the Hilbert series. As a recent extension, Normaliz can handle unbounded polyhedra. The Hilbert basis computation can be considered as solving a linear diophantine system of inhomogeneous equations, inequalities and congruences.

This package encapsulates a libnormaliz cone and gives access to it in the **GAP** environment. In this way **GAP** can be used as interactive interface to libnormaliz.