Bonjour;
J'ai un problème d'execution du code latex.. mais je voix pas l erreur. Voici mon code
\documentclass[largeextended,15pt]{svjour3}
\smartqed
\usepackage[sans]{dsfont}
\usepackage{enumitem}
\usepackage{graphics}
\usepackage{latexsym, epsfig, amsmath, amssymb, amsfonts}
\usepackage{mathrsfs, graphics, fancyhdr, setspace, color}
\usepackage[bookmarksnumbered, plainpages, backref, colorlinks]{hyperref}
\usepackage{graphicx, latexsym}
\usepackage{mathptmx}
\usepackage{cite}
\hypersetup{
colorlinks = true, %Colours links instead of ugly boxes
urlcolor = blue, %Colour for external hyperlinks
linkcolor = blue, %Colour of internal links
citecolor = blue %Colour of citations
}
\begin{document}


\begin{equation*}
f(x,y) = \left\{
\begin{array}{lll}

\frac{y}{x} \quad \text{if} \quad x < a ; \\
[x,y] \quad \text{if} \quad x=a; \\
\frac{x}{3y}\quad \text{ if } \quad x
> a.
\end{array}
\right.
\end{equation*}
\end{document}
Merci