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Could anyone tell me, how can I obtain an equation numbering as displayed in the textsample? I am talking about (4.1)_\pm.

E.DiBenedetto, Partial Differential Equations

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    Welcome to TeX.SE! \tag{} is what you need. Btw, please add a source you take the screenshot from. – user156344 Feb 28 at 14:15
  • Thank you, I already tried, but unfortunately \tag{} is not producing the desired result. It Looks like ((1)_-). Moreover, I would prefer a solution where the equation-number is determinier by Latex and not by myself, as I will need to refer to these equations later. – E.ElBehi Feb 28 at 14:28
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    Please, the name is “Ennio De Giorgi”, with a space. Writing it “DeGiorgi”, US style, is wrong. – egreg Feb 28 at 14:46
  • Sorry, the extract is not my work. And besides DeGiorgi-function classes are written like this, throughout the literature. Besides, this is not the topic here – E.ElBehi Feb 28 at 14:56
3

Try:

\documentclass[12pt]{article}
    \usepackage[a4paper]{geometry}
    \usepackage{amsmath}
    \numberwithin{equation}{section}

\begin{document}
\section{First}
\begin{equation}
a = b \tag*{(\theequation)$_{\pm}$}\refstepcounter{equation}
\end{equation}
\begin{equation}
c = d \tag*{(\theequation)$_{-}$}\refstepcounter{equation}
\end{equation}
\end{document} 

enter image description here

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    @Mico Agreed. My answer was just a quick and dirty trick to add section numbers to equation number while using article. – Denis Mar 1 at 12:47
  • @Denis - I've taken the liberty of editing your code to modify the way the composite "numbering" of equations is performed. – Mico Mar 1 at 13:40

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