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%%
%% Der LaTeX-Begleiter, zweite Auflage (September 2005)
%%
%% Beispiel 8-2-30 von Seite 497.
%%
%% Copyright (C) 2005 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% Uebersetzung: Copyright (C) 2005 Claudia Krysztofiak,
%%    Rebecca Stiels und Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%

\documentclass{lb2examargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{113.4372pt}

\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{subequations}  \label{eq:1}
\begin{align}  f  &= g            \label{eq:1A} \\
               f' &= g'           \label{eq:1B} \\
    \mathcal{L}f  &= \mathcal{L}g \label{eq:1C}
\end{align}
\end{subequations}
\begin{subequations}  \label{eq:2}
\renewcommand\theequation{\theparentequation\roman{equation}}
\begin{align}  f  &= g            \label{eq:2A} \\
               f' &= g'           \label{eq:2B} \\
    \mathcal{L}f  &= \mathcal{L}g + K  \label{eq:2C}
\end{align}
\end{subequations}
Man beachte die Beziehung zwischen~\eqref{eq:1}
und~\eqref{eq:2}: nur~\ref{eq:1C} und~\ref{eq:2C}
sind verschieden.
\end{document}