How can I add a printer for Wi-Fi printing?
You can use the following URL to access any public printer at PGI/JCNS from a Wi-Fi connection:
How can I update my CentOS machine?
Change to console mode using Ctrl+Alt+F1. Login with your user account and invoke the centosu command.
Is it possible to include LaTeX formulas in a Mayavi plot?
Mayavi does not support LaTeX math formulas directly but we over a python module which draws LaTeX output as a Mayavi color map. Have a look at Topics → Using LaTeX formulas in Mayavi (Python).