%% 
%%  Der Mathematiksatz mit LaTeX, 1. Auflage 2009
%% 
%%  Example 10-9-12 on page 235.
%% 
%%  Copyright (C) 2009 Herbert Voss
%% 
%%  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[]{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{355.65944pt}
\usepackage[ngerman]{babel}
\AtBeginDocument{\setlength\parindent{0pt}}
\setlength\marginparwidth{1cm}
\setcounter{equation}{34}
\renewcommand\theequation{10.\arabic{equation}}
\StartShownPreambleCommands
\usepackage{amsmath,ragged2e}
\newcommand\eqnmarg[2]{%
  \noindent%
  \hspace*{-\marginparsep}\llap{\parbox[c][.5\height]{%
  \marginparwidth}{\RaggedRight#2}}\hspace{\marginparsep}%
  \begin{minipage}[c]{.99\linewidth}#1\end{minipage}}
\StopShownPreambleCommands
\begin{document}
\eqnmarg{%
  \begin{align}
    & \frac {\sigma_{m,y,d}} {k_m \cdot f_{m,y,d}}
	 + \frac {\sigma_{c,0,d}}{k_{c,y} \cdot f_{c,0,d}} \leq 1,0 \\[1ex]
    & \qquad\text{mit: } k_{c,y} = \min
     \left(\frac{1}{k+\sqrt{k^2-\lambda_{rel,c}^2}}; 1 \right) &&\nonumber
  \end{align}}%
{\tiny Dies ist jetzt eine Anmerkung zur nebenstehenden Gleichung.}

\eqnmarg{%
  \begin{align}
    & \frac {\sigma_{m,y,d}} {k_m \cdot f_{m,y,d}} \\[1ex]
    & \qquad\text{ mit: }k_{c,y} = \min &&\nonumber
  \end{align}}%
{\tiny Dies ist jetzt auch eine Anmerkung zur nebenstehenden Gleichung.}
\end{document}