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Great thanks split is what I was looking for. I rather split the long equation like this

\documentclass[%
3p, % document type
11pt, % fontsize
sort&compress % »natbib« feature
]{elsarticle}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{mathtools} % loads »amsmath ...

The only way I have found to do something like the result I am looking for is this

\documentclass[%
3p, % document type
11pt, % fontsize
sort&compress % »natbib« feature
]{elsarticle}

\newcommand\pder[2]{\dfrac{\partial#1}{\partial#2}}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc ...

Thank you. But this fix the problem just in this particular case. Later in the text I add another diffusive term in the equation, and the result is not good because the equation is too long. Is it a way to "superimpose" the two lines of the split equations on the same vertical zone in a way to a ...

Ok I read the second link you gave me. sorry about that but from the first link it was not clear (or i missed it) that packages and stuff like \begin{document} were mandatory. I also reduced the size of the system to make it really minimal, now i have only 2 equations. But smaller than this it is ...

Ok thanks adding subequations does what I need for the letter. As for the paging, I either would like to force the labels inline on this minimal example (where no equation is split over 2 lines):


\begin{subequations}\label{eqn:binomi}
\begin{empheq}[left=\empheqlbrace]{align}
%
& \pder{ h_1 ...

Dear all,

I am getting trying to reach the following result with empheq. I have a system of equation and I would like to numerate each equation as 1a, 1b, 1c... so I can refer both to the single equation (e.g see equation (1a)) and the entire system (e.g. see system (1)). This is what I did but I ...