The Invar Tensor Package
Simplification of polynomials with Riemann tensor and manipulation of
The Invar Tensor Package is a simplifier of algebraic expressions that
contain Riemann or other tensors. The Invar tensor package has a database build on top of the
Canon Tensor Package which is fully included in this version. The database contains
scalar invariants (polynomial and differential) up to Riemann^7, and up to Riemann^5 * epsilon,
and up to 10 covariant derivatives of Riemann.
The present version (2.1) is documented in
the paper The Invar tensor package: Differential invariants of Riemann, by J.M. Martín-García,
Yllanes and R. Portugal, Computer Physics Communications,
to appear. See also
Download the current version (2.1) and
The Invar tensor package runs on top of Maple 9.5, 10 or 11.
Version 2.1 has interface with
There is a version for
Mathematica at the website
Download old version (1.0) and
related files. See the readme_v1.txt file for
Version 1.0 is documented in the paper The Invar
tensor package, by J.M. Martín-García, R. Portugal
and L. Manssur, Computer Physics Communications
177 (2007) 640-648. See also the
Comments or bug reports: Portugal_at_Lncc.Br
Do not hesitate to send me bug reports.
Last update: April, 2008.
Maintained by Renato Portugal/LNCC-MCT, Brazil.