Math & Science ⇒ amsmath | Unnecessary vertical Space with '\overset'

[koffer]

Hi everyone,

I have a weird problem when I use \overset from the amsmath package within squared brackets. For some reason it produces some extra space below the symbol as if it would expect that there is also something below the symbol.

Here is a minimal example:

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\begin{document}
  \[
    \left[ \overset{*}{A} \right]_{i,j}
  \]
\end{document}

Does anyone know how to get rid of that space?


Thanks in advance,
Koffer

[o3hq]

I'm not sure whether it'll work, but that's what I do when I have the problem with \figure:

\vspace{-1in}

for example. Notice the number is negative, since you want to get rid of space. Hope it works!

[koffer]

I tried it, but it unfortunately doesn't work.

Here's the code for this:

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\begin{document}
	\[
		\left[ \vspace{-1in}\overset{*}{A} \right]_{i,j}
	\]
\end{document}

It still shows the same space below the A.

[localghost]

Defining a new command might be the better alternative. The code for this command is borrowed from the \dddot command provided by the amsmath package. For a better fit it has been modified a bit.

Code: Select all

\documentclass{article}
\usepackage{amsmath}

\makeatletter
\newcommand{\oset}[2]{%
  {\mathop{#2}\limits^{\vbox to -.5\ex@{\kern-\tw@\ex@
   \hbox{\scriptsize #1}\vss}}}}
\makeatother

\begin{document}
  \[
    \left[\oset{*}{A}\right]_{i,j} \ne \left[\overset{*}{A}\right]_{i,j}
  \]
\end{document}

Thorsten

[koffer]

Great! Thank you very much, Thorsten! That works and looks really good. Though, I don't quite understand the tex code...