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 \hbox{%
 \vbox{%%
    \hbox{\makebox[5.1cm][l]{Universit\"at T\"ubingen}}
    \hbox{\makebox[5.1cm][l]{Fachbereich Mathematik}}
    \hbox{\makebox[5.1cm][l]{Name: xx}} % Tagen Sie hier Ihren Namen ein
}%
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 \vbox{%
 \hbox{\makebox[1.0cm][r]{SoSe 2020}}
 \hbox{\makebox[1.0cm][r]{xx.xx.2020}}  % Datum Ihres Portfolioeintrages
 \hbox{\makebox[1.0cm][r]{Woche 05}}    % Nummer Ihres Portfolioeintrages
}}
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\small\normalsize
\begin{center}{\Large\bf  Portfolio zur  Analysis II
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{\bf Frage 17.}  Erl\"autern Sie, warum die {\sl Eulersche Zahl} durch die Reihe $\sum_{n=0}^\infty1/n!$ beschrieben 
werden kann und wie man sie auf zwei Dezimalstellen hinter dem Komma genau berechnen kann.
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{\bf Antwort.}
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{\bf Frage 18.}  Warum konvergiert die {\sl Leibnizsche Reihe} $\sum_{n=1}^\infty(-1)^{n-1}/n$ gegen $\ln(2)$?
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{\bf Frage 19.}  Sei $I\sub\R$ ein offenes Intervall. Wann hei\ss t eine Funktion $f\colon I\to\R$ {\sl reell-analytisch}?
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{\bf Antwort.}
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{\bf Frage 20.}  Formulieren Sie den {\sl Identit\"atssatz f\"ur reell-analytische Funktionen} und erl\"autern Sie, warum
man das als {\sl Starrheit} interpretiert.
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{\bf Antwort.}
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