I happens quite often that I need to insert an equation in one of my presentation slides or posters. Although either OpenOffice or Powerpoint have some way to present formulas or equations, their quality and appeal is quite poor. For my personal taste, there is still no better way than LaTex formatted equations, but it is a quite cumbersome way to render the formula on the PC, then generate an image and insert it into the presentation. Fortunately, a lot of web pages allow to render LaTex equations on-line. My personal favourite is this one, which produces the output on-the-fly and allows to store the rendered image as (transparent) GIF files. On the left side of this post is an example of rendering below’s LaTex code

` A_{m,n} =`

\begin{pmatrix}

a_{1,1} & a_{1,2} & \cdots & a_{1,n} \\

a_{2,1} & a_{2,2} & \cdots & a_{2,n} \\

\vdots & \vdots & \ddots & \vdots \\

a_{m,1} & a_{m,2} & \cdots & a_{m,n}

\end{pmatrix}

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