http://stackoverflow.com/questions/18743721/mpi-bordered-block-system-matrix-with-lu-decomposition

Here the GDB error: http://bpaste.net/show/tDDBNTyqVpUjxFUF3qSr/

I'm sorry for the Italian comments, please ignore it. Btw the code
should be clear. Thanks so much in advance.

Have a nice day guys!
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Best Regards,
Mauro Crociara