simpliziale Approximation

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diff --git a/buch/chapters/95-homologie/images/approximation.tex b/buch/chapters/95-homologie/images/approximation.tex
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+%
+% approximation.tex -- Approximation einer Abbildung durch eine simpliziale
+%
+% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+%
+\documentclass[tikz]{standalone}
+\usepackage{amsmath}
+\usepackage{times}
+\usepackage{txfonts}
+\usepackage{pgfplots}
+\usepackage{csvsimple}
+\usetikzlibrary{arrows,intersections,math}
+\begin{document}
+\def\skala{1.3}
+\begin{tikzpicture}[>=latex,thick,scale=\skala]
+
+\definecolor{darkred}{rgb}{0.8,0,0}
+\definecolor{darkred}{rgb}{0,0,0}
+
+\def\gitter{
+	\foreach \x in {1,1.5,...,6}{
+		\draw[color=gray] (\x,1) -- (\x,6);
+		\draw[color=gray] (1,\x) -- (6,\x);
+	}
+}
+
+\def\s{1.05}
+
+\def\colorsector{
+	\foreach \r in {3,3.2,...,5.8}{
+		\foreach \a in {20,...,69}{
+			\pgfmathparse{(\a-20)/50}
+			\xdef\rot{\pgfmathresult}
+			\pgfmathparse{(\r-3)/3}
+			\xdef\blau{\pgfmathresult}
+			\definecolor{mycolor}{rgb}{\rot,0.8,\blau}
+			\fill[color=mycolor]
+				(\a:{\s*\r}) -- (\a:{\s*(\r+0.2)}) -- ({\a+1}:{\s*(\r+0.2)}) -- ({\a+1}:{\s*\r}) -- cycle;
+		}
+	}
+}
+
+\begin{scope}[xshift=0cm]
+\colorsector
+\gitter
+\foreach \r in {3,3.5,...,6.0}{
+	\draw[color=black,line width=0.4pt] (20:{\s*\r}) arc (20:70:{\s*\r});
+}
+\foreach \a in {20,28.3333,...,70}{
+	\draw[color=black,line width=0.4pt] (\a:{\s*3}) -- (\a:{\s*6});
+}
+\begin{scope}
+\clip (20:{\s*3}) -- (20:{\s*6}) arc (20:70:{\s*6}) -- (70:{\s*3});
+\foreach \a in {-5,...,5}{
+	\draw[color=black,line width=0.4pt]
+		plot[domain={20+8.33333*\a}:{70+8.3333*\a},samples=100]
+			(\x:{\s*(3+3*(\x-(20+8.3333*\a))/50)});
+}
+\end{scope}
+
+\end{scope}
+
+\begin{scope}[xshift=5.5cm]
+\input{approx.tex}
+\end{scope}
+
+\end{tikzpicture}
+\end{document}
+