2

This question already has an answer here:

In the following example, the symbol \omega does not show up after compiling the file. This is the first Greek later for which I have this kind of the problem. Is there a way to solve this problem. This question is related to my previous question in Problem with inserting the symbols \times and \omega when using arabi package

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[LFE,LAE,OT1]{fontenc}
\usepackage[farsi,english,arabic]{babel}

\begin{document}
\selectlanguage{farsi} 
$\omega$ 
\end{document}

marked as duplicate by egreg, Svend Tveskæg, Werner, Paul Gaborit, Mensch Mar 25 '15 at 14:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

2

Again there seems to be something being redefined. A simple solution is to define your own command, in this case \myomega.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[LFE,LAE,OT1]{fontenc}
\usepackage[farsi,english,arabic]{babel}
\mathchardef\myomega="0121

\begin{document}
\selectlanguage{farsi} 
$\myomega$ 
\end{document}

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