\begin{equation}
\left\{
\begin{matrix}
Maximiser &L(\alpha)=\sum_{i=1}^{n} \alpha_i -\sum_{i=1}^{n}\sum_{j=1}^{n}\alpha_i \alpha_j y_iy_j \textbf{x}^T\textbf{x} &\\
\text{sous contraintes} & & \\
& \sum_{i=1}^{n}\alpha_iy_i=0 \\
& \alpha_i>0&
\end{matrix}
\right.
\end{equation}
[Tex/LaTex] How to align left bracket equation
equationshorizontal alignmentmatrices
Best Answer
I would like to suggest that (a) the equations be typeset in display style -- done most easily by using a
dcases
environment -- and (b) the constraint statements be aligned on their respective inequality/equality particles -- using, say, analigned
environment. Oh, and do use\mathbf
instead of\textbf
while in math mode.