How to display a matrix-vector equation on one line in LaTeX

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kimspg
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A bit OT, I know, but there must be a way to get matrices to appear on the same line so I can write matrix-vector equations.
 
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matrices can usually be displayed with an array argument, plus some bracketing argument
 
Like this?

[tex] \sigma_{3} = \left(<br /> \begin{array}{cc}<br /> 1 & 0\\<br /> 0 & -1<br /> \end{array}<br /> \right)[/tex]

- Warren