# Numbering equations inside left brace

Please, How can I write three numbering equations with left brace. Usually I use "\numcases" but with a specific springer template this gives a different color text and different numbering position.

I also try with "empheq", but it results not numbered equations.

\begin{empheq}[left=\empheqlbrace]{align}
&\psi_{\delta}^{-},\psi_{\delta}^{+}\equiv 1\text{ respectively on }K_{\delta}^{-},K_{\delta}^{+},\label{eq3.3}\\
&0 \leq\psi_{\delta}^{-},\psi_{\delta}^{+}\leq 1,\label{eq3.4}\\
&\text{Supp}(\psi_{\delta}^{-})\cap\text{Supp}(\psi_{\delta}^{+})\equiv\emptyset.\label{eq3.5}
\end{empheq}
Moreover
$$\label{eq3.6} \Vert\psi_{\delta}^{-}\Vert_{S}\leq\delta,\ \Vert\psi_{\delta}^{+}\Vert_{S}\leq\delta,$$


• Which Springer template do you employ? Which packages -- other than cases -- do you load? – Mico May 16 at 10:33
• Since the odd behavior using Springer is probably deliberate, I wouldn't try to change it. – John Kormylo May 16 at 11:03
• % This is a general template file for the LaTeX package SVJour3 % for Springer journals. Springer Heidelberg – M.A May 16 at 12:47

It's possible with witharrrows. This package provides a environment {DispWithArrows} similar to the environment {align} of amsmath but with some other features (among them the possibility to add arrow, as the name says).

In {DispWithArrows}, it's possible to add text before a brace regrouping the equations. This text is added in an optional argument (between angular brackets < and >). In this optional argument is provided with no content, only the brace is added. That's what I have done.

\documentclass{article}
\usepackage{amsmath}
\usepackage{witharrows}

\begin{document}

\begin{DispWithArrows}<>
&\psi_{\delta}^{-},\psi_{\delta}^{+}\equiv 1\text{ respectively on }K_{\delta}^{-},K_{\delta}^{+},\label{eq3.3}\\
&0 \leq\psi_{\delta}^{-},\psi_{\delta}^{+}\leq 1,\label{eq3.4}\\
&\text{Supp}(\psi_{\delta}^{-})\cap\text{Supp}(\psi_{\delta}^{+})\equiv\emptyset.\label{eq3.5}
\end{DispWithArrows}
Moreover
$$\label{eq3.6} \Vert\psi_{\delta}^{-}\Vert_{S}\leq\delta,\ \Vert\psi_{\delta}^{+}\Vert_{S}\leq\delta,$$

\end{document}


• ! witharrows error: "expl3 too old". – M.A May 16 at 13:03
• @M.A : You should update your LaTeX installation completely. It's always a good thing to have a LaTeX installation up-to-date. – F. Pantigny May 16 at 13:13
• Do you mean [Bibdesk, Tex live Utility and Tex shop]? – M.A May 16 at 13:28
• You should update TeXLive. There is a major version of TeXLive each year. TeXLive 2020 has been released in April. I don't use TeXLive (I use MikTeX) but I have been told that you should do a kind of desinstallation of TeXLive before reinstallation of the new version (2020). – F. Pantigny May 16 at 13:43