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

https://www.google.com.br/search?client=ubuntu&channel=fs&q=birkmult+document+class&ie=utf-8&oe=utf-8&gfe_rd=cr&ei=5jT7VJq6HOmp8we_mYHIDw#channel=fs&q=birkmult+document+class+tex

https://www.google.com.br/search?client=ubuntu&channel=fs&q=birkmult+document+class&ie=utf-8&oe=utf-8&gfe_rd=cr&ei=5jT7VJq6HOmp8we_mYHIDw

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.

enter image description here

Is there a way around to access this archaic letter?

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    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
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    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
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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

enter image description here

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  • 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

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