Recommended method to submit Mathematica in graphical mode:

ssh yourusername@beo03.unifr.ch

qrsh -pe smp 8 xterm

8- means number of cpus. If you need 1 cpu put there 1 or skip (-pe smp 8) but only for 1cpu jobs.

/apps/bin/mathematica

You can also use batch mode submittion with script.

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In your .bashrc you should have PAHT to executables

export PATH=/apps/mathematica/7.0/Executables:$PATH