[Tex/LaTex] multiple subequations same line with reference compact

aligncross-referencingequationslabelssubequations

I posted a question earlier,

multiple subequations same line with reference

But I'd like to be able to combine the numbering at the end of the line for the following two cases:

Re = UL/nu , Ha = BL sqrt(sigma/(rho nu)),   Re_m = mu sigma UL      (4a,4b,4c)

And

Re = UL/nu , Ha = BL sqrt(sigma/(rho nu)),   Re_m = mu sigma UL      (4-6)

This code has all numbers, but they're in-between

\begin{subequations}
    \begin{tabularx}{\hsize}{@{}XXX@{}}
        \begin{equation}
            Re = \frac{U L}{\nu}, \label{eq:UBCs_D100}
        \end{equation} &
        \begin{equation}
            Ha = B L \sqrt{\frac{\sigma}{\rho \nu}}, \label{eq:UBCs_D200}
        \end{equation}
        \begin{equation}
            Re_m = \mu_{m} \sigma U L \label{eq:UBCs_N00}
        \end{equation}
    \end{tabularx}
\end{subequations}

Any help is greatly appreciated!

Best Answer

Hm, very unusual request ... however if you persist, try

\documentclass{article}
    \usepackage{amsmath}
    \usepackage{tabularx}
        \begin{document}
\begin{subequations}
    \begin{tabularx}{\hsize}{@{}XXXc@{}}
\begin{equation}\label{eq:UBCs_D100}
    Re = \frac{U L}{\nu},                       \notag
    \addtocounter{equation}{1}
\end{equation}  &
\begin{equation}\label{eq:UBCs_D200}
    Ha = B L \sqrt{\frac{\sigma}{\rho \nu}},    \notag
    \addtocounter{equation}{1}
\end{equation}  &
\begin{equation} \label{eq:UBCs_N00}            \notag
    Re_m = \mu_{m} \sigma U L
\end{equation}
                & (\ref{eq:UBCs_D100},\ref{eq:UBCs_D200},\ref{eq:UBCs_N00})
    \end{tabularx}
\end{subequations}
\begin{equation} \label{eq:UBCs_N100}           
    a = b
\end{equation}

From above code you should catch idea, how to manage your problem. I didn't bother with formatting as you not provide MWE (which can be compiled).

Edit: An another solution with better formatting of equations. Here instead tabularx is used minipages aligned at their bottom:

\documentclass{article}
    \usepackage{amsmath}
    \usepackage{tabularx}

        \begin{document}
\begin{subequations}
\setlength{\tabcolsep}{0pt}
\noindent\begin{minipage}{0.28\hsize}
\begin{equation}[b]\label{eq:UBCs_D100}
    Re = \frac{U L}{\nu},                       \notag
    \addtocounter{equation}{1}
\end{equation}
\end{minipage}\begin{minipage}[b]{0.28\hsize}
\begin{equation}\label{eq:UBCs_D200}
    Ha = B L \sqrt{\frac{\sigma}{\rho \nu}},    \notag
    \addtocounter{equation}{1}
\end{equation}
\end{minipage}\begin{minipage}[b]{0.28\hsize}
\vskip-5pt
\begin{equation} \label{eq:UBCs_N00}            \notag
    Re_m = \mu_{m} \sigma U L
\end{equation}
\end{minipage}
\hfill(\ref{eq:UBCs_D100},\ref{eq:UBCs_D200},\ref{eq:UBCs_N00})
\end{subequations}

\begin{equation} \label{eq:UBCs_N100}
    a = b
\end{equation}
    \end{document}

Result:

Interestingly, both solution only works with equation environment. At use of gather or other amsmath environments the sub-equations labels are lost.

Related Solutions

Table of Contents – List of Equations Including Contents and Captions: A How-To Guide

Since you want a cheat sheet, I'd recommend the extract package. With a slightly different MWE:

\documentclass{article}
\usepackage[
  active,
  header=false,
  copydocumentclass=true,
  generate=\jobname-Cheatsheet,
  extract-env={equation},
  extract-cmdline={synopsis},
  ]{extract} % http://ctan.org/pkg/extract
\begin{extract*}
% Items executed in both the main and extracted document
% (extract manual, section 5.1)
\usepackage{amsmath}
\end{extract*}
\begin{extract}
% Items executed only in extracted document
\def\synopsis#1{#1}
\end{extract}
\def\synopsis#1{}
\begin{document}
First Euler observed that
\synopsis{Euler's equation tying together the five fundamental constants of mathematics}%
\begin{equation}
1 + e^{i \Pi} = 0.
\end{equation}

Then, Gauss discovered the normal distribution:
\synopsis{Normal distribution}%
\begin{equation}
P(x) = \frac{1}{{\sigma \sqrt {2\pi } }}e^{{{ - \left( {x - \mu } \right)^2 } \mathord{\left/ {\vphantom {{ - \left( {x - \mu } \right)^2 } {2\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {2\sigma ^2 }}}
\end{equation}

Finally, Einstein proclaimed: 
\synopsis{Equivalence of mass and energy}%
\begin{equation}
E = m C^2
\end{equation}
\end{document}

you get an original document of:

enter image description here

and an extracted document of:

\documentclass{article}
% Items executed in both the main and extracted document
% (extract manual, section 5.1)
\usepackage{amsmath}
% Items executed only in extracted document
\def\synopsis#1{#1}

\begin{document}

\synopsis{Euler's equation tying together the five fundamental constants of mathematics}%

\begin{equation}
1 + e^{i \Pi} = 0.
\end{equation}

\synopsis{Normal distribution}%

\begin{equation}
P(x) = \frac{1}{{\sigma \sqrt {2\pi } }}e^{{{ - \left( {x - \mu } \right)^2 } \mathord{\left/ {\vphantom {{ - \left( {x - \mu } \right)^2 } {2\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {2\sigma ^2 }}}
\end{equation}

\synopsis{Equivalence of mass and energy}%

\begin{equation}
E = m C^2
\end{equation}

\end{document}

and:

enter image description here

This also works with your original \caption command.

Subequations – Multiple Subequations on the Same Line with Reference

Actually, I found the second answer in my third reference to do the job.

 \noindent
 \begin{subequations}
   \begin{tabularx}{\hsize}{@{}XXX@{}}
     \begin{equation}
       \pmb{u} = \pmb{u}_{b} \label{eq:UBCs_D100}
     \end{equation} &
     \begin{equation}
       \pmb{u} = \pmb{0} \label{eq:UBCs_D200}
     \end{equation}
     \begin{equation}
       \frac{\partial \pmb{u}}{\partial n} = 0 \label{eq:UBCs_N00}
     \end{equation} &
     \begin{equation}
       \pmb{u} = \text{periodic} \label{eq:UBCs_P200}
     \end{equation}
   \end{tabularx}
 \end{subequations}

Best Answer

Related Solutions

Table of Contents – List of Equations Including Contents and Captions: A How-To Guide

Subequations – Multiple Subequations on the Same Line with Reference

Related Question