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+%% EMathTst.tex for demonstrating EdnMath0.sty. 
+%% Uwe L"uck, http://www.contact-ednotes.sty.de.vu, 2005/01/16. 
+\documentclass[12pt]{article}
+\def\Anote#1#2{#1} \let\<\relax \let\>\relax 
+% \usepackage{ednotes}
+\usepackage[mathrefs]{lineno}
+
+\begin{document}
+
+\begin{linenumbers}
+% \begin{NoNotesToMath} 
+\linenumberdisplaymath 
+\noindent 
+\texttt{\string\ \unskip linelabel} and 
+\texttt{\string\ \unskip Anote} in math mode? 
+\begin{linenomath}
+$$ 
+% \begin{displaymath}
+% \begin{equation}
+x=\Anote{z}{$Z$}
+% {\makeatletter \typeout{\meaning\@EN@lemmatag}}
+\linelabel{Hm}
+% \end{equation}
+% \end{displaymath}
+$$ 
+\end{linenomath}
+% \end{NoNotesToMath} 
+$a=\Anote{x\<y\>z}{$b$}
+% {\makeatletter \typeout{\meaning\@EN@lemmatag}}
+\linelabel{Hmm}
+$. 
+Why not? 
+\begin{NoNotesToMath}
+Line No.~\ref{Hm}. 
+\Anote{No \<math\> here.}{Went wrong earlier.}
+% {\makeatletter \typeout{\meaning\@EN@lemmatag}}
+\end{NoNotesToMath}
+Line No.~\ref{Hmm}.
+\end{linenumbers}
+
+% \tracingonline=1 
+% \showboxdepth=1
+% \showboxbreadth=30
+% \showlists
+
+% % These really get lost: 
+% \linenumbers 
+% \mbox{\Anote{Boxed}{where?}.\linelabel{Hu}} 
+% Line No.~\ref{Hu}.
+
+\end{document}
+
+