Math & Science ⇒ Placement of "comma"/"point" between 2 lines of equations

[juk80]

Hi everybody,

I use the following code to define math operations, here a group operation.

Code: Select all

%preamble: centers content in an alignat cell, instead of left/right alignment 
\newcommand*\centermathcell[1]{\omit\hfil$\displaystyle#1$\hfil\ignorespaces}

% usage in text: definition of a binary operation with subequation label on each line 
\begin{subequations}
\begin{alignat}{5}
	& \circ  && \ :\quad && \centermathcell{G \times G } && \centermathcell{\quad\to\quad}     && G\\
	&        &&          && \centermathcell{(g, h)}      && \centermathcell{\quad\mapsto\quad} && g \circ h := \circ(g, h)
\end{alignat}
\end{subequations}

I like the style, but sometimes I need a "comma" or a "point" at the end of the definition (somehow between the 2 lines) in order to integrate it with the text flow (see pic attached, highlighted in yellow).
Can anyone help me with the placement of the "comma"/"point" at the end of the definition and still have the sub equation labels on each line.

Thx in advance.

Kind regards,
Jens

[MjK]

Please always try to make a minimal working example instead of showing only a code snippet.

To place the comma between the line, you could add a \raisebox after the longest line:

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\newcommand*\centermathcell[1]{\omit\hfil$\displaystyle#1$\hfil\ignorespaces}

\begin{document}

\begin{subequations}
\begin{alignat}{5}
	& \circ  && \ :\quad && \centermathcell{G \times G } && \centermathcell{\quad\to\quad}     && G\\
	&        &&          && \centermathcell{(g, h)}      && \centermathcell{\quad\mapsto\quad} && g \circ h := \circ(g, h)\smash{\text{\quad\raisebox{.5\baselineskip}{,}}}
\end{alignat}
\end{subequations}

\end{document}

However, I would not add the comma centered, but just at the end of the last line:

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\newcommand*\centermathcell[1]{\omit\hfil$\displaystyle#1$\hfil\ignorespaces}

\begin{document}

\begin{subequations}
\begin{alignat}{5}
	& \circ  && \ :\quad && \centermathcell{G \times G } && \centermathcell{\quad\to\quad}     && G\\
	&        &&          && \centermathcell{(g, h)}      && \centermathcell{\quad\mapsto\quad} && g \circ h := \circ(g, h)\text{\enskip,}
\end{alignat}
\end{subequations}

\end{document}

[juk80]

Thx MjK, this will work.
You are, of course, right about the minimal working example - duly noted!