Is there a get around to make $\surd$ variable-sized via standard AMS package? For example, I would like $\surd \frac{a}{b}$ to look like $\sqrt{\frac{a}{b}}$ with the elongated left line but no overline on $\frac{a}{b}$.
[Tex/LaTex] Making a variable-sized surd
symbols
Related Solutions
I think you can more or less copy the definitions from amsmath.sty:
\documentclass{minimal}
\usepackage{amsmath}
\makeatletter
\newcommand*{\Relbarfill@}{\arrowfill@\Relbar\Relbar\Relbar}
\newcommand*{\xeq}[2][]{\ext@arrow 0055\Relbarfill@{#1}{#2}}
\makeatother
\begin{document}
$a \xeq[uuuuu]{vvv} b$
\end{document}
You can use the braket package for this kind of thing.
\documentclass{article}
\usepackage{braket}
\usepackage{amsmath}
\usepackage{bbold}
\begin{document}
\[
\mathcal{H}=\Set{ h(x)=\sum_{i=0}^{k-1}a_{i}x_{i}\mod m\ |
\ a_{i}\in\mathbb{Z}_{m^{k}}}
\]
\end{document}
It defines a \Set macro which automatically puts its contents in variable sized braces, and any instance of the | symbol inside will adjust accordingly. This solution also has the advantage of making your source code more semantic.
Best Answer
Use the following definition:
and the test: