# elsarticle: problems with \begin{cases}

The following simple code does not compile with Texlive 2016

\documentclass{elsarticle}
\begin{document}
$$\sum_{i=0}^{d-1}(\xi^j)^i=\begin{cases} d &\text{si }j=0\\ 0 &\text{sinon}. \end{cases}$$
\end{document}


With amsart class, everything is OK. Any hint or idea to solve this problem is welcome.

• Welcome to TeX.SX, please consider making a full but minimal working example as explained in this question. – Diaa Nov 20 '16 at 18:53
• Package amsmath is missing. elsarticle doesn't load it (as amsart does. – Zarko Nov 20 '16 at 19:01
• Simply load amsmath(or, better mathtools: you'll have improved cases variants). Also don't use the syntax $$…$$: it's plain TeX syntax, and you'll have bad spacing. – Bernard Nov 20 '16 at 19:02
• To the comments of Bernard, Zarko and Diaa, you use $...$ instead $$...$$. – Sebastiano Dec 8 '16 at 12:51