On Jan 1, 2012, at 10:46 AM, Jean-Louis Cordonnier wrote:
> In order to write genetics, I need something like $\frac{A}{a}$ but with
> a double horizontal bar -- and left( and right)
> I tried this, but there is too much white around it.
>
> \newcommand\gen[2]{ %genotype
>
> $
>
> \left(
>
> \begin{array}{c} #1 \\
>
> \hline \hline #2\\
>
> \end{array}
>
> \right)
>
> $
>
You can reduce the white space inside the parentheses using a negative mkern.
Eg,
\newcommand\gen[2]{ %genotype
$
\left(\mkern-4mu
\begin{array}{c} #1 \\
\hline \hline #2\\
\end{array}
\mkern-4mu\right)
$}
Michael
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