Problem with formatting a matrix

ake Sather  ------ Paolo Marcheschi e-mail: [EMAIL PROTECTED] --   #LyX 1.1 created this file. For more info see http://www.lyx.org/ \lyxformat 2.15 \textclass article \language italian \inputencoding latin1 \fontscheme times \graphi

document margins

ather  -- Paolo Marcheschi e-mail: [EMAIL PROTECTED] --