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I am relatively new working with LaTeX and I don't know how to solve this problem.

I have several equations that I wrote in a general form, but when writing them, I want to show that the general form is just a generalization for three specific formulas; i.e.

I have this

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but I want to have this:

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P.S: I could use the command tag like in this post Customize equation numbering for Equation environment?, but I have over 60 equations and I could not use the command tag for each line individually (Also, there could be multiple errors doing it manually) Can someone help me please?

My MWE is:

 \documentclass[a4paper,12pt]{article} \usepackage[spanish]{babel} \usepackage[latin1]{inputenc} \usepackage{amsmath} \begin{document} \begin{equation} E=mc^2 \end{equation} \end{document}

EDIT: For more clarity, I put some equations with subscript (j) and others not; and those with subscript I want to be counted not as just one equation; but from n (number of previous equation) to j (from 1 to 3).I know how to set this MANUALLY, but that wouldn't be efficient nor exent of mistakes since we are talking of over 100 equations in different sections). An example is:

enter image description here

My MWE is the following:

\begin{document} \begin{equation} F=ma \end{equation} \begin{equation} E=m_{j}c^2 \tag{2), (3), (4} \end{equation} \setcounter{equation}{4} \begin{equation} A=B+C \end{equation} \begin{equation} D_{j}= E_{j} + F_{j} \tag{6), (7), (8} \end{equation} \end{document}
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  • Welcome! \begin{equation} E=mc^2 \tag{1),(2),(3} \end{equation} gives you that output. (I am not sure I understand the purpose, though. Maybe you want to explain where the numbers derive from such that one can provide a more automatic solution?) Commented Nov 9, 2019 at 0:24
  • Can you describe the how you come up with 3 equation numbers next to the equation? Will there always be 3, or sometimes 2 and then occasionally 1? Please elaborate. Anything is possible, but we need some specifics in terms of the use case. Commented Nov 9, 2019 at 1:45
  • @Schrödinger'scat I only put tag to put an example; this would work with one line. However, I have multiple lines and I need the counter to work (for some lines n+1; for others n+3) Commented Nov 9, 2019 at 9:21
  • @Werner There would be some lines that will count as just one equation (counter: n+1 being n the previous equation number counted) ; others for three (n + 3) Commented Nov 9, 2019 at 9:24
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    @IgnacioRuizNestosa How are you going to refer to these multi-label equations? That is, if this equation has the label \label{eq:Einstein}, what should \eqref{eq:Einstein} give you? Commented Nov 9, 2019 at 9:49

3 Answers 3

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I'm not sure it's a good idea, particularly if you never refer to a single case. You can just refer to “Equations (1)”, which will give readers the hint that they're more than one.

Anyway, here's an implementation that also allows to refer to a single equation from the bunch.

\documentclass{article} \usepackage{amsmath,xparse} \ExplSyntaxOn \NewDocumentCommand{\multinumber}{mo} { \addtocounter{equation}{-1} \seq_clear:N \l__ignacio_multinumber_seq \int_step_inline:nn { #1 } { \refstepcounter{equation} \IfValueT{#2}{ \use:c{ ltx@label } {#2-##1} } \seq_put_right:Nx \l__ignacio_multinumber_seq { (\theequation) } } \tag* { \seq_use:Nn \l__ignacio_multinumber_seq { ,~ } } \addtocounter{equation}{1} } \ExplSyntaxOff \begin{document} References: \ref{Einstein} (global), \ref{Einstein-1} (first) \begin{equation} F=ma \end{equation} \begin{equation}\label{Einstein} E=m_{j}c^2 \multinumber{3}[Einstein] \end{equation} \begin{equation} A=B+C \end{equation} \begin{equation} D_{j}= E_{j} + F_{j} \multinumber{3} \end{equation} \end{document}

enter image description here

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  • Thank you @egreg! It works perfect! Commented Nov 9, 2019 at 21:06
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Not sure if it is a good idea use a tag as a reference, because then, it should be counted or not? Is 1+2+3=4 or it is simply 1+2+3? What the reader must expect for the next equation, 4 or 5? That is, the sequence must be 1,2,3,1+2+3,4,... or maybe 1,2,3,1+2+3(=4),5...?.

Anyway, for the first case, is possible using \label{} and \ref{}, and for the second, you must add also a \addtocounter{equation}{1} in the 4th (1+2+3) equation:

mwe 

\documentclass{article} \usepackage[spanish]{babel} \usepackage{amsmath} \usepackage[colorlinks]{hyperref} \begin{document} Siendo la masa ... \begin{equation}\label{a} m = \gamma m_0 = \frac{m_0}{\sqrt{1-v^2/c^2}} \end{equation} Y el momento linear es bla bla ... \begin{equation}\label{b} E = \sqrt{p^2c^2+m^2c^4} = \gamma mc^2 \end{equation} Por lo dicho anteriormente, .... \begin{equation}\label{c} \gamma = \frac{1}{\sqrt{1-(\frac{v}{c})^2}} \approx 1+ \frac{1}{2} \left(\frac{v}{c} \right)^2 \end{equation} Entonces, juntándolo todo \eqref{d} llegamos a: \begin{equation}\label{d} %\addtocounter{equation}{1} E=mc^2 \tag{\ref{a},\ref{b},\ref{c}} \end{equation} Lo que está tan claro como que 2 y 2 son: \begin{equation}\label{e} 2+2=22 \end{equation} \end{document}
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  • Hi @Fran. Please refer to the edited part of the question for more clarity. Commented Nov 9, 2019 at 10:35
  • @IgnacioRuizNestosa Then you want \tag{\theequation, \addtocounter{equation}{1}\theequation, \addtocounter{equation}{1}\theequation} but then cannot be referenced properly in text! Commented Nov 9, 2019 at 10:54
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This allows you to add multiple equation numbers via a command \multitag.

\documentclass[a4paper,12pt]{article} \usepackage[spanish]{babel} \usepackage[latin1]{inputenc} \usepackage{mathtools} \newcounter{iloop} \newcounter{imax} \newcommand{\MultiNum}{\edef\temp{}% \setcounter{iloop}{0}\loop% \stepcounter{iloop}% \ifnum\value{iloop}<\value{imax}% \edef\temp{\temp\number\value{equation}),(}\refstepcounter{equation}% \repeat% \edef\temp{\temp\number\value{equation}}% \refstepcounter{equation}} \newcommand\multitag[1][1]{\setcounter{imax}{#1}% \MultiNum% \tag{\temp}} \begin{document} Einstein \begin{equation}\label{eq:Einstein} E=mc^2 \multitag[3] \end{equation} Photon \begin{equation}\label{eq:Photon} E=h\nu \multitag[2] \end{equation} Thermo \begin{equation} E=TS \end{equation} Wrong \begin{equation}\label{eq:Wrong} E=mc^3 \end{equation} \eqref{eq:Wrong} is wrong, \eqref{eq:Einstein} is correct, and so is \eqref{eq:Photon}. \end{document}

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