2

This question already has an answer here:

I'd like to use the Greek letter qoppa in a formula in an otherwise non-Greek document. I tried using the greekoption for babelbut that turned my document into Greek letters. By default, \qoppadoesn't seem to be defined.

marked as duplicate by Malipivo, Svend Tveskæg, user13907, Andrew, Thorsten Apr 5 '15 at 11:59

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4

Since the qoppa is a stylized symbol, there's probably no need to try and find a version suitable for any font.

Since you want it in math, the simplest thing is to define a stripped down version of the LGR encoding.

\documentclass{article}
\usepackage{amsmath,pdftexcmds}

\DeclareFontFamily{U}{cbgreek}{}
\DeclareFontShape{U}{cbgreek}{m}{n}{
        <-6>    grmn0500
        <6-7>   grmn0600
        <7-8>   grmn0700
        <8-9>   grmn0800
        <9-10>  grmn0900
        <10-12> grmn1000
        <12-17> grmn1200
        <17->   grmn1728
      }{}
\DeclareFontShape{U}{cbgreek}{bx}{n}{
        <-6>    grxn0500
        <6-7>   grxn0600
        <7-8>   grxn0700
        <8-9>   grxn0800
        <9-10>  grxn0900
        <10-12> grxn1000
        <12-17> grxn1200
        <17->   grxn1728
      }{}

\DeclareRobustCommand{\qoppa}{%
  \text{\usefont{U}{cbgreek}{\normalorbold}{n}\symbol{19}}%
}
\DeclareRobustCommand{\Qoppa}{%
  \text{\usefont{U}{cbgreek}{\normalorbold}{n}\symbol{21}}%
}
\makeatletter
\newcommand{\normalorbold}{%
  \ifnum\pdf@strcmp{\math@version}{bold}=\z@ bx\else m\fi
}
\makeatother

\begin{document}

$\qoppa+\xi=\alpha-\Qoppa$

\boldmath

$\qoppa+\xi=\alpha-\Qoppa$

\end{document}

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