delimitersmath-modespacingsymbolstypography
I want to typeset the following in TeX (without the arguments).
< , >
I know that I can accomplish this by doing \langle , \rangle
As an example I want to write something like the follwing:
…The adjoints are with respect to the ( \langle , \rangle ) and not with respect to ( ( , ) )
But spacing on either side of the comma inside \langle \rangle does not look right.
How does one fix this? Thanks.
Here are some considerations, since this question is open-ended:
\documentclass{article}
\usepackage{xcolor}% http://ctan.org/pkg/xcolor
\newcommand{\parm}{\mathord{\color{black!33}\bullet}}%
\begin{document}
\[
f(x,.) \quad f(x,\cdot) \quad f(x,\ast) \quad f(x,\star) \quad
f(x,\bullet) \quad f(x,\parm)
\]
\end{document}
I've included \parm which is a 33% black \bullet, perhaps a little more subtle than the full-fledged solid \bullet. Whatever you choose, best to define a command that sets such a "placeholder". If you're after something "fancy", I would suggest you peruse the tables of symbols contained in Scott Pakin's Comprehensive LaTeX Symbol List.
After Johannes_b pointed me in the right direction, it turned out that using \captionsetup[subtable]{position=auto} fixes the spacing in all four cases.
After some experimentation, it seemed to me that the \caption of the outer table environment somehow affected the \caption used in the inner subtable environment. This led med to attempt wrapping the table \caption in a \begingroup-\endgroup pair to isolate any side-effects. In the following MWE, this was done with the problematic case 4:
\documentclass{article}
\usepackage{booktabs,caption,subcaption,blindtext}
\captionsetup[subtable]{skip=20pt}
\newcommand\exampletable{
\begin{tabular}{ll}
\toprule
A & B\\
\bottomrule
\end{tabular}
}
\begin{document}
A single line of text that shows the spacing between the text and the float.
\begin{table}[!h]
\caption{Main caption}
\centering
\begin{subtable}[t]{10em}
\centering
\exampletable
\caption{Subcaption 1}
\end{subtable}
\end{table}
A single line of text that shows the spacing between the text and the float.
\begin{table}[!h]
\begingroup
\caption{Main caption}
\endgroup
\centering
\begin{subtable}[t]{10em}
\centering
\exampletable
\caption{Subcaption 1}
\end{subtable}
\end{table}
A single line of text that shows the spacing between the text and the float.
\end{document}
And the result confirms the suspicion:
Table 2 in the image above corresponds to the case where \caption was used within a group.
After some digging through the caption source code, it turns out that the \caption@position macro is set as a result of using \caption in the table environment (it is undefined initially, unless overridden globally), and it is tested for with the \caption@iftop macro when \caption is used again in the subtable environment. In other words, the position attribute of the caption in the outer environment will override the caption position in nested environments, if their \caption commands succeed the \caption command of the outer environment, and the caption positions of the nested environments haven't been set explicitly.
To confirm this, I tried to reset the value of \caption@position after the table caption:
\begin{table}[!h]
\caption{Main caption}
\makeatletter
\let\caption@position\@undefined
\makeatother
\centering
\begin{subtable}[t]{10em}
\centering
\exampletable
\caption{Subcaption 1}
\end{subtable}
\end{table}
and it turned out that this had the same effect as wrapping the \caption in a group.
Note that the code above should not be used as a solution to this problem! Even the caption package source code states that the \caption@position macro should not be depended on.
It turns out that using \captionsetup[subtable]{position=auto} will result in a call to \caption@setposition{auto} before the subtable caption is output, and the auto argument will simply do \let\caption@position\@undefined, which is exactly what we wanted.
Best Answer
I think that there are two most sensible options:
$\langle\,,\rangle$\cdots in place of the arguments:$\langle\cdot,\cdot\rangle$(this is what I prefer).Typeset versions:
In the second one, if you don't like the space after the comma:
$\langle\cdot{,}\cdot\rangle$