Team on Technlogy schrieb:

Matrices are rendered too big when the
  \renewcommand\arraystretch{2.2}
is added to the preamble (LyX 1.4.5)

So why are you adding this then to the preamble?
(For informations, how to customize math, have a look at the new math manual 
that comes with LyX 1.5.4.)

By the way, i woudl like better looking vector and matrices. Any
suggestions about font to use?

You mean the fonts within LyX or in the PDF. To get nicer fonts within LyX, upgrade from LyX 1.4.5 to LyX 1.5.4. For the PDF, use e.g. the Latin Modern fonts.

regards Uwe

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