Installing Mathematica on Linux - iteloo/formality-tools GitHub Wiki
From the Wolfram User Portal, you should be able to download the Mathematica installer script. For Mathematica 9.0.1, it was called Mathematica_9.0.1_LINUX.sh
.
Run this as root (forgot if necessary),
sudo sh Mathematica_9.0.1_LINUX.sh
and follow the instructions in the prompt.
Running mathematica
The Mathematica installer should have already created symlinks in your /usr/local/bin
directory, so to run the Mathematica shell, simply run
math