Matrices in equations

Question

I would like to know how it is possible to put matrices and determinants inside equations. In particular I would like to know how to generate the following equality:

Thanks in advanced!

Mico · Accepted Answer

The amsmath package provides an environment called pmatrix -- short for "matrix surrounded by (round) parentheses", I suppose -- which is perfectly suited for the job.

documentclass{beamer}
usepackage{amsmath,amssymb}
begin{document}
begin{frame}
[
det
begin{pmatrix}
   lambda & -1 
   q & lambda+p
end{pmatrix}
=0
quad Leftrightarrow quad
lambda^2+plambda+q=0
]
end{frame}
end{document}

Sebastiano · Answer

If you want just one part of your formula using the article class, it is possible, for example to use, sansmath package, within the enviroment,
begin{sansmath} 
....
....
end{sansmath}

Here there is a small example,
documentclass[a4paper,12pt]{article}
usepackage{amsmath,amssymb}
usepackage{sansmath}
begin{document}
This text it is written with the Computer Modern font.
begin{sansmath} 
[det
begin{pmatrix}
lambda & -1
q & lambda+p
end{pmatrix}
=0 iff lambda^2+plambda+q=0
]
end{sansmath}
After you have the same initial font.
end{document}

Matrices in equations

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