# The Invar tensor package

## Description

Abstract The Invar package is introduced, a fast manipulator of generic scalar polynomial expressions formed from the Riemann tensor of a four-dimensional metric-compatible connection. The package can maximally simplify any polynomial containing tensor products of up to seven Riemann tensors within seconds. It has been implemented both in Mathematica and Maple algebraic systems. Title of program: Invar Tensor Package Catalogue Id: ADZK_v1_0 Nature of problem Manipulation and simplification of tensor expressions. Special attention on simplifying scalar polynomial expressions formed from the Riemann tensor on a four-dimensional metric-compatible manifold. Versions of this program held in the CPC repository in Mendeley Data ADZK_v1_0; Invar Tensor Package; 10.1016/j.cpc.2007.05.015 ADZK_v2_0; Invar Tensor Package v2.0; 10.1016/j.cpc.2008.04.018 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)