Merge remote-tracking branch 'upstream/master'

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diff --git a/buch/chapters/60-gruppen/images/nichtkomm.tex b/buch/chapters/60-gruppen/images/nichtkomm.tex
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+++ b/buch/chapters/60-gruppen/images/nichtkomm.tex
@@ -0,0 +1,68 @@
+%
+% nichtkomm.tex
+%
+% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+%
+\documentclass[tikz]{standalone}
+\usepackage{times}
+\usepackage{amsmath}
+\usepackage{txfonts}
+\usepackage[utf8]{inputenc}
+\usepackage{graphics}
+\usetikzlibrary{arrows,intersections,math}
+\usepackage{ifthen}
+\begin{document}
+
+\definecolor{darkgreen}{rgb}{0,0.6,0}
+
+\newboolean{showgrid}
+\setboolean{showgrid}{false}
+\def\breite{7}
+\def\hoehe{4}
+
+\begin{tikzpicture}[>=latex,thick]
+
+% Povray Bild
+\node at (0,0) {\includegraphics[width=14cm]{c60.jpg}};
+
+% Gitter
+\ifthenelse{\boolean{showgrid}}{
+\draw[step=0.1,line width=0.1pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
+\draw[step=0.5,line width=0.4pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
+\draw                            (-\breite,-\hoehe) grid (\breite, \hoehe);
+\fill (0,0) circle[radius=0.05];
+}{}
+
+\coordinate (A) at (-0.3,3);
+\coordinate (B) at (-1.1,2);
+\coordinate (C) at (-2.1,-1.2);
+\draw[->,color=red,line width=1.4pt]
+        (A)
+        to[out=-143,in=60]
+        (B)
+        to[out=-120,in=80]
+        (C);
+%\fill[color=red] (B) circle[radius=0.08];
+\node[color=red] at (-1.2,1.5) [above left] {$R_{x_1,\alpha}$};
+\coordinate (D) at (0.3,3.2);
+\coordinate (E) at (1.8,2.8);
+\coordinate (F) at (5.2,-0.3);
+\draw[->,color=blue,line width=1.4pt]
+        (D)
+        to[out=-10,in=157]
+        (E)
+        to[out=-23,in=120]
+        (F);
+%\fill[color=blue] (E) circle[radius=0.08];
+\node[color=blue] at (2.4,2.4) [above right] {$R_{x_2,\beta}$};
+\draw[->,color=darkgreen,line width=1.4pt]
+        (0.7,-3.1) to[out=1,in=-160] (3.9,-2.6);
+\node[color=darkgreen] at (2.5,-3.4) {$R_{x_3,\gamma}$};
+
+\node at (6.4,-2.9) {$x_1$};
+\node at (-0.2,3.8) {$x_3$};
+
+\end{tikzpicture}
+
+\end{document}
+