==== Hello Jehan ====

Latex Writing works for example like this: 

$\alpha$ is given by \alpha included in \$  \$

or we can generate an equation by


  \begin{equation}
  \sum_{n=0}^{\infty} \beta_{n}
  \end{equation}

leading to 
\begin{equation}
\sum_{n=0}^{\infty} \beta_{n}
\end{equation}