# [Tex/LaTex] plus-minus symbol with parenthesis around the minus sign

symbols

I need one (or maybe two) LaTeX symbols that I don't find in the comprehensive list of symbols. The symbol is like the normal plus-minus sign \pm, but with parenthesis around the minus sign. Is such a symbol available somewhere? And if not, what is the best way to construct it from (, \pm and )?

Preferably I would also want the opposite: \mp with parenthesis around the plus.

Any ideas?

I once proposed the following definitions

\newcommand\varpm{\mathbin{\vcenter{\hbox{%
\oalign{\hfil$\scriptstyle+$\hfil\cr
\noalign{\kern-.3ex}
$\scriptscriptstyle({-})$\cr}%
}}}}
\newcommand\varmp{\mathbin{\vcenter{\hbox{%
\oalign{$\scriptstyle({+})$\cr
\noalign{\kern-.3ex}
\hfil$\scriptscriptstyle-$\hfil\cr}%
}}}}


Example

\documentclass{article}
\newcommand\varpm{\mathbin{\vcenter{\hbox{%
\oalign{\hfil$\scriptstyle+$\hfil\cr
\noalign{\kern-.3ex}
$\scriptscriptstyle({-})$\cr}%
}}}}
\newcommand\varmp{\mathbin{\vcenter{\hbox{%
\oalign{$\scriptstyle({+})$\cr
\noalign{\kern-.3ex}
\hfil$\scriptscriptstyle-$\hfil\cr}%
}}}}

\begin{document}
$a\varpm b\varmp c$
\end{document}