# Accessing archaic Greek Koppa in the birkmult document class

I will be submitting the final version of an article to Birkhauser using the required birkmult document class.

It turns out that there are errors when I want to include the teubner package. This prevents me from accessing the archaic Greek Koppa which I have used in earlier publication on the topic.

Is there a way around to access this archaic letter?

• The magic word is MWE... You have been here a while, so please help users to help you ;-) – user31729 Mar 7 '15 at 17:43
• Since it seems quite difficult to download the birkmult.cls (I only found a copy from 1994), can you tell where it is available? – egreg Mar 7 '15 at 18:06

You can access that symbol by loading the LGR font encoding and declaring

\newcommand\Koppa{\begingroup\fontencoding{LGR}\selectfont\char21\endgroup}


so you don't have to load the teubner package.

MWE (tried with birkmult.cls downloaded from http://www3.math.tu-berlin.de/numerik/mt/trunk/birkmult.cls and works fine)

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[LGR,T1]{fontenc}

\newcommand\Koppa{\begingroup\fontencoding{LGR}\selectfont\char21\endgroup}

\begin{document}

This is my archaic Greek Koppa: \Koppa

\end{document}


Output

• Sorry for the bump, but is there any way to modify the implementation so that it also works between  and in math environments? Right now, it completely breaks my document if enclosed in either of these structures. – ThePuix Feb 16 at 18:53