# Numbering of a table with three equations while centering them with equal sign cause me a lot of trouble

I want to reproduce this image (Table in Latex.png).

I am using Texmaker. Any help with that would be greatly appreciated. I need this because I am writing an article. I am an intermediate learner of LaTeX. If to simpliy you can put only one number at the right, I would not mind. And of course, I need to b e able to reference it. I know it is a lot, but it will be a good lesson for all.

Mario

• Welcome to LaTeX.SE. Pleae tell us which document class you employ.
– Mico
Mar 22, 2023 at 18:43
• what you try so far? Try to insert each equation in the own minipage. Mar 22, 2023 at 19:04
• Don't you think numbering like that potentially confuses the reader? The (1) and (2) become a bit hidden compared to (3). I would use only one number. Mar 22, 2023 at 19:49
• After looking at my document, I realize that it is looking odd. But nevertheless, the answers that I received are very instructive. Mar 24, 2023 at 15:07

By use of cases of mathtools package, inserted in the minipages as I mentioned in comment:

\documentclass{article}
\usepackage{mathtools}

\begin{document}
\noindent%
\begin{minipage}{0.33\linewidth}
$$\begin{rcases} 1 & t>0 \\ -1 & t<0 \end{rcases}$$
\end{minipage}%
\begin{minipage}{0.33\linewidth}
$$\begin{rcases} 1 & t>0 \\ -1 & t<0 \end{rcases}$$
\end{minipage}%
\begin{minipage}{0.33\linewidth}
$$\begin{rcases} 1 & t>0 \\ -1 & t<0 \end{rcases}$$
\end{minipage}
\end{document}


• I should have specified that I use Texmaker in conjunction with MikTex. Your solution worked but MikTex had to install 8 packages. For me, I will have to learn how to manipulate that. But the result is there. Thank you very much. Mar 23, 2023 at 19:32
• Could you explain what is the use of the % in your code please? Mar 24, 2023 at 15:09
• @M.Lemelin, to see, what it due, test answer, where you remove it. \noindent remove indent of the first minipage. if after it is empty space, then minipage will move to right fortiny space. This is prevent by %˛ immediately after \noindent command. In general, % comment code in line after it. Mar 24, 2023 at 15:20

Assuming you use one of the main LaTeX document classes, i.e., article, report, or book, or a document class that's based on of these classes, the following example may be of interest to you.

\documentclass{article} % or some other suitable document class
\usepackage{amsmath}    % for 'aligned' env.
\usepackage{showframe}  % draw frame lines around text block

\begin{document}
\left. \begin{aligned} x &= r\cos\phi,\\ y &= r\sin\phi, \end{aligned} \right\rbrace \refstepcounter{equation}(\theequation) \qquad \left. \begin{aligned} x &= r\cos\phi,\\ y &= r\sin\phi,\\ z &= z, \end{aligned} \right\rbrace \refstepcounter{equation}(\theequation) \qquad \left. \begin{aligned} x &= r\cos\theta,\\ y &= r\sin\theta\cos\phi,\\ z &= z\sin\theta\sin\phi. \end{aligned} \right\rbrace \refstepcounter{equation}(\theequation)

\end{document}

• Your solution worked when we look at the equations. Unfortunately, even though I love the idea of a box around it, the code create three box??? See the image in this link. Mar 23, 2023 at 19:40
• I forgot to say that I thank you very much for your response. It fell reassuring to know that you can find help so fast here. Mar 23, 2023 at 19:41
• @M.Lemelin - The rectangular frame boxes are drawn because the showframe package is loaded in the code shown above. The upshot? Don't load the showframe package in you real document.
– Mico
Mar 23, 2023 at 20:26

1. Right braces for emphasis are obtained with right=\empheqbigrbrace in empheq environment
2. Equations may get side-by-side numbering when using minipage environment. It is provided by LaTeX itself, but a better way to do it is with adjustbox environment

Code

\documentclass{book}

\usepackage{empheq}

\begin{document}

\begin{adjustbox}{minipage={\dimexpr 0.333\linewidth - 1em \relax}, valign=m}

\begin{empheq}[right=\empheqbigrbrace]{equation}
\begin{alignedat}{2}
x &= r \cos\phi,
\\
y &= r \sin\phi,
\end{alignedat}
\end{empheq}

\hspace{\fill}%
\begin{adjustbox}{minipage={\dimexpr 0.333\linewidth - 1em \relax}, valign=m}

\begin{empheq}[right=\empheqbigrbrace]{equation}
\begin{alignedat}{2}
x &= r \cos\phi,
\\
y &= r \sin\phi,
\\
z &= z,
\end{alignedat}
\end{empheq}

\hspace{\fill}%
\begin{adjustbox}{minipage={\dimexpr 0.333\linewidth - 1em \relax}, valign=m}

\begin{empheq}[right=\empheqbigrbrace]{equation}
\begin{alignedat}{2}
x &= r \cos\theta,
\\
y &= r \sin\theta \cos\phi,
\\
z &= r \sin\theta \sin\phi.
\end{alignedat}
\end{empheq}

\end{document}

• What's the purpose of using alignedat{2} environments when there's a single alignment point per row? Should it maybe be alignedat{1} (or aligned)?
– Mico
Mar 22, 2023 at 19:18
• alginedat allows for better control of spacing Mar 22, 2023 at 19:19
• What spacing are you controlling? Please elaborate.
– Mico
Mar 22, 2023 at 19:57
• alginedat` does not insert spaces between columns, meaning I get to set spaces to my exact desires. tex.stackexchange.com/questions/672096/… Mar 22, 2023 at 20:05
• I stll don't understand: Since there's just one alignment point per row, what do you mean by "I get to set spaces to my exact desires"?
– Mico
Mar 22, 2023 at 20:30