Does anyone know how to make (nice looking) double bracket multiset notation in LaTeX. i.e something like (\binom{n}{k})
where there are two outer brackets instead of 1 as in binomial? You can see an example of what I mean in http://en.wikipedia.org/wiki/Multiset under the heading "Multiset coefficients" with the double brackets.
In wikpedia they typset it as: \left(\!\!{n\choose k}\!\!\right)
but although this works well for LaTeX in maths mode, with inline equations the outer bracket becomes much larger than the inner bracket.
I have also tried using \genfrac{((}{))}{0pt}{}{n}{k}
but it has an error with the double brackets.
I am using \binom
as well in my document, so I would like the bracket sizes to be similar for \binom
and \multiset
.
Thanks for any help. I'm surprised I can't find a solution on google.