xTras: A fieldtheory inspired xAct package for mathematica
Abstract
We present the tensor computer algebra package xTras, which provides functions and methods frequently needed when doing (classical) field theory. Amongst others, it can compute contractions, make Ansätze, and solve tensorial equations. It is built upon the tensor computer algebra system xAct, a collection of packages for Mathematica.
 Publication:

Computer Physics Communications
 Pub Date:
 June 2014
 DOI:
 10.1016/j.cpc.2014.02.006
 arXiv:
 arXiv:1308.3493
 Bibcode:
 2014CoPhC.185.1719N
 Keywords:

 Mathematica;
 Computer algebra;
 Tensor calculus;
 Field theory;
 Combinatorics;
 General relativity;
 Riemann tensor;
 Young tableaux;
 Computer Science  Symbolic Computation;
 Computer Science  Mathematical Software;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 29 pages. The package can be downloaded from http://www.xact.es/xtras/