annotate notes/tex/growth.tex @ 45:e65f4b1a6e32

remove fairly useless setbeamercovered
author Markus Kaiser <markus.kaiser@in.tum.de>
date Wed, 08 Jan 2014 14:26:02 +0100
parents 3de775b67d8c
children
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1 \defineUnit{landausymbole}{%
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2 {
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3 \pgfplotsset{
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4 standard/.style={
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5 axis lines=middle,
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6 enlarge x limits=0.1,
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7 enlarge y limits=0.1,
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8 mark size=.4pt,
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9 only marks,
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10 xtick=\empty,
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11 ytick=\empty,
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12 xlabel={$\N$},
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13 ylabel={$\R$},
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14 every axis x label/.style={at={(current axis.right of origin)},anchor=west},
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15 every axis y label/.style={at={(current axis.above origin)},anchor=south},
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16 every x tick/.style={semithick, black},
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17 domain=0:2,
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18 samples=50,
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19 clip=false,
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20 height=.5\textheight,
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21 }
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22 }
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23
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24 \begin{frame}
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25 \frametitle{Asymptotisches Verhalten}
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26
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27 \begin{definition}[Asymptotisches Verhalten]
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28 Eine Funktion $g$ ist \structure{asymptotisch größer} (\structure{wächst asymptotisch schneller}) als eine andere Funktion $f$, wenn gilt
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29 \begin{align}
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30 \exists n_0 > 0 \forall n \geq n_0.\; \left| f(n) \right| < \left| g(n) \right|
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31 \end{align}
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32 \end{definition}
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33 \begin{itemize}
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34 \item Der Einfachheit halber betrachten wir \alert{strikt positive} Funktionen
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35 \item Dann sind die Beträge egal
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36 \vspace{2em}
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37 \item Oftmals sind \structure{Vorfaktoren} nicht interessant
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38 \end{itemize}
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39
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40 \begin{center}
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41 \begin{tikzpicture}
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42 \begin{axis}[
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43 standard,
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44 extra x ticks={1},
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45 extra x tick style={
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46 thick,
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47 xticklabel={$n_0$}
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48 },
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49 ]
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50 \addplot[tumblue]{sqrt(x)} node[right]{$\hphantom{c_{<1} \cdot {}}f$};
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51 \only<2->{
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52 \addplot[tumblue]{.6 * sqrt(x)} node[right]{$c_{<1} \cdot f$};
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53 \addplot[tumblue]{1.4 * sqrt(x)} node[right]{$c_{>1} \cdot f$};
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54 }
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55 \addplot[tumred]{2^x - 1} node[pos=0.95, above left]{$g$};
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56 \only<1>{
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57 \addplot[ycomb, mark=square*, mark size=1pt, semithick] plot coordinates {(1,1)};
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58 }
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59 \end{axis}
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60 \end{tikzpicture}
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61 \end{center}
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62 \end{frame}
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63
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64 \begin{frame}
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65 \frametitle{Landausymbole}
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66
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67 \begin{definition}[Asymptotische obere Schranke]
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68 Seien $f,g$ \alert{strikt positiv}.
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69 Eine Funktion $f$ wächst \structure{asymptotisch maximal so schnell} wie eine Funktion $g$, wenn gilt
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70 \begin{align}
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71 \exists c > 0\exists n_0 > 0 \forall n \geq n_0.\; f(n) \leq c \cdot g(n)
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72 \end{align}
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73 wir schreiben dann
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74 \begin{align}
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75 f &\in \Oh(g)
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76 \end{align}
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77 \end{definition}
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78
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79 \vfill
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80
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81 \begin{center}
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82 \begin{tikzpicture}
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83 \begin{axis}[
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84 standard,
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85 extra x ticks={1},
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86 extra x tick style={
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87 thick,
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88 xticklabel={$n_0$}
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89 },
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90 ]
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91 \addplot[tumblue]{sqrt(x)} node[pos=0.9, below]{$f$};
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92 \addplot[tumred]{2^x - 1} node[pos=0.95, above left]{$g$};
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93 \addplot[ycomb, mark=square*, mark size=1pt, semithick] plot coordinates {(1,1)};
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94 \end{axis}
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95 \end{tikzpicture}
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96 \end{center}
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97 \end{frame}
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98
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99 \begin{frame}
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100 \frametitle{Landausymbole}
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101
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102 \begin{itemize}
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103 \item $\Oh(g)$ ist eine Menge von Funktionen \ldots
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104 \item \ldots die maximal so schnell wachsen wie $g$
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105 \end{itemize}
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106
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107 \vspace{-1em}
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108 \begin{columns}
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109 \begin{column}{1.03\textwidth}
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110 \begin{definition}[Landausymbole]
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111 Seien $f,g$ \alert{strikt positiv}.
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112 Analog zu $\Oh(g)$ definiert man weitere Mengen von Funktionen.
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113 \begin{align}
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114 \structure{o(g)} &\defeq \left\{ f \mid \alert{\forall c} > 0\exists n_0 > 0 \forall n \geq n_0.\; f(n) \alert{<} c \cdot g(n) \right\} \tag{\structure{langsamer}}\\
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115 \noalign{\smallskip}
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116 \structure{\Oh(g)} &\defeq \left\{ f \mid \alert{\exists c} > 0\exists n_0 > 0 \forall n \geq n_0.\; f(n) \alert{\leq} c \cdot g(n) \right\} \tag{\structure{nicht schneller}}\\
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117 \noalign{\smallskip}
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118 %\structure{\Theta(g)} &\defeq \left\{ f \mid f \in \Oh(g) \wedge f \in \Omega(g) \right\} \tag{\structure{gleich schnell}}\\
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119 \structure{\Theta(g)} &\defeq \Oh(g) \cap \Omega(g) \tag{\structure{gleich schnell}}\\
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120 \noalign{\smallskip}
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121 \structure{\Omega(g)} &\defeq \left\{ f \mid \alert{\exists c} > 0\exists n_0 > 0 \forall n \geq n_0.\; f(n) \alert{\geq} c \cdot g(n) \right\} \tag{\structure{nicht langsamer}}\\
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122 \noalign{\smallskip}
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123 \structure{\omega(g)} &\defeq \left\{ f \mid \alert{\forall c} > 0\exists n_0 > 0 \forall n \geq n_0.\; f(n) \alert{>} c \cdot g(n) \right\} \tag{\structure{schneller}}
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124 \end{align}
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125 \vspace{-1em}
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126 \end{definition}
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127 \end{column}
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128 \end{columns}
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129
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130 \vspace{2em}
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131 Es ist
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132 \begin{align}
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133 o(g) &\subseteq \Oh(g) & o(g) \cap \Omega(g) &= \emptyset\\
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134 \omega(g) &\subseteq \Omega(g) & \omega(g) \cap \Oh(g) &= \emptyset
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135 \end{align}
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136 \end{frame}
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137
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138 \begin{frame}[c]
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139 \frametitle{Darstellung mit Grenzwerten}
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140
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141 \begin{theorem}[Landausymbole mit Grenzwerten]
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Markus Kaiser <markus.kaiser@in.tum.de>
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142 \smallskip
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Markus Kaiser <markus.kaiser@in.tum.de>
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143 Existiert der Grenzwert $\lim_{n \to \infty} \left| \frac{f(n)}{g(n)} \right|$, dann gilt
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Markus Kaiser <markus.kaiser@in.tum.de>
parents:
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144
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Markus Kaiser <markus.kaiser@in.tum.de>
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145 \begin{align}
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Markus Kaiser <markus.kaiser@in.tum.de>
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146 f &\in \structure{o(g)} &\text{gdw.}&& \lim_{n \to \infty} &\left| \frac{f(n)}{g(n)} \right| = 0\\
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Markus Kaiser <markus.kaiser@in.tum.de>
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147 f &\in \structure{\Oh(g)} &\text{gdw.}&& 0 \leq \lim_{n \to \infty} &\left| \frac{f(n)}{g(n)} \right| < \infty\\
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Markus Kaiser <markus.kaiser@in.tum.de>
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148 f &\in \structure{\Theta(g)} &\text{gdw.}&& 0 < \lim_{n \to \infty} &\left| \frac{f(n)}{g(n)} \right| < \infty\\
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Markus Kaiser <markus.kaiser@in.tum.de>
parents:
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149 f &\in \structure{\Omega(g)} &\text{gdw.}&& 0 < \lim_{n \to \infty} &\left| \frac{f(n)}{g(n)} \right| \leq \infty\\
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Markus Kaiser <markus.kaiser@in.tum.de>
parents:
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150 f &\in \structure{\omega(g)} &\text{gdw.}&& \lim_{n \to \infty} &\left| \frac{f(n)}{g(n)} \right| = \infty
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Markus Kaiser <markus.kaiser@in.tum.de>
parents:
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151 \end{align}
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Markus Kaiser <markus.kaiser@in.tum.de>
parents:
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152 \end{theorem}
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Markus Kaiser <markus.kaiser@in.tum.de>
parents:
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153 \end{frame}
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Markus Kaiser <markus.kaiser@in.tum.de>
parents:
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154 }
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Markus Kaiser <markus.kaiser@in.tum.de>
parents:
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155 }