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Thanks localghost. Your code given above is confirming what I thought. So the solution I gave is the most appropriate one for my personal taste (better global appearance of the matrix equation). In any cases, the problem I exposed in the first message (when I started the topic) is completely solved ...

For matrices the mathtools package offers appropriate solutions. You can learn more about math typesetting in the » Math mode « document. Can you be more specific with the following example ? Lets suppose we want a 3 x 3 matrix with some positive and negative numbers. We would want all numbers to b...

Thanks a lot, Thorsten. Both solutions are working perfectly !

EDIT : The macro above also solves a small alignment problem I had with matrices. Great ! Thanks again !

I'm getting a compilation error with this small equation, and I don't know why. What is wrong here ? Of course, the problem isn't in the preambule. All the document is compiling fine, except for the following equation: \begin{equation} \epsilon_{ijk} = \left\{ \begin{align} 1 \quad & \text{si $i...