[Tex/LaTex] multiple subequations same line with reference

aligncross-referencingequationslabelssubequations

I'm trying to write several equations on one line, include a label for each equation, and also be able to view the equation number for each equation. Is this possible? I've seen several related questions but not ever including all the things I need, and I can't seem to get it working.

Here are some relevant questions:
Multiple subequation labels in one \ref

https://stackoverflow.com/questions/3328806/latex-multiple-equation-references-in-one

How to place and number 3 short equations in one line?

What I need is something like

 \begin{subequations}
 \begin{align}
   \pmb{u} = \pmb{u}_{b} \label{eq:UBCs_D1}
 \end{align}
 \begin{align}
   \pmb{u} = \pmb{0} \label{eq:UBCs_D2}
 \end{align}
 \begin{align}
   \pmb{u} = \text{periodic} \label{eq:UBCs_P2}
 \end{align}
 \end{subequations}

Where all the equations (and their numbering) appear on the same line.

Any help is greatly appreciated.

Best Answer

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}

Related Solutions

[Tex/LaTex] How to align long subequations while breaking each one

mathtools provides the multlined "subenvironment", which shifts the first line left, the last line right, and applies only one number to each subequation. put multiple multlined subequations together with gather:

\documentclass{article}
\usepackage{mathtools}
\begin{document}
\noindent X\hrulefill X\ignorespaces
\begin{subequations}
\label{energy13}
\begin{gather}
\begin{multlined}
 u_e\frac{\partial \left(\varrho_e u_e\right)}{\partial t}
+ u_e\frac{\partial \left(\varrho_e u_e^2\right)}{\partial s}
+ u_e\frac{\partial \left(\varrho_e u_e v_e\right)}{\partial n} 
-2 \varrho_e \varOmega u_e v_e \\ 
=- u_e\frac {\partial p_e}{\partial s}
+\qquad
+\varrho_e u_e\left(\varOmega^2R_{OPs}+\frac{\partial\varOmega}{\partial 
t}(R_{OPn}+n)-\frac{\partial^2 R_{Os}}{\partial t^2}\right)
\end{multlined}
 \\
\begin{multlined}
 u\frac{\partial \left(\varrho u\right)}{\partial t}
+ u\frac{\partial \left(\varrho u^2 \right)}{\partial s}
+ u\frac{\partial \left(\varrho u v \right)}{\partial n}  
-2 \varrho \varOmega u v \\
=- u\frac {\partial p}{\partial s}
+\mu u\frac {\partial^2 u}{\partial n^2}
+\varrho u \left(\varOmega^2R_{OPs}+\frac{\partial\varOmega}{\partial 
t}(R_{OPn}+n)-\frac{\partial^2 R_{Os}}{\partial t^2}\right)
\end{multlined}
\end{gather}
\end{subequations}
\end{document}

output of example code

the equation numbers are centered vertically on the subequations, rather than being set on the last line -- that's how all the "subenvironments" work.

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

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.

Best Answer

Related Solutions

[Tex/LaTex] How to align long subequations while breaking each one

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

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