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Is there someone who can explain me, why the fraction in align-mode looks bigger than the one in the math-mode? I would like to have the same size in both modes, hehe...Thank you!

enter image description here

\documentclass[a4paper, fontsize=11pt]{scrbook}
\usepackage{geometry} \geometry{a4paper, top=25mm, left=25mm, right=25mm, bottom=20mm, headsep=10mm, footskip=12mm} % Seitenlayout
\usepackage[ngerman]{babel} 
\usepackage[T1]{fontenc}     
\usepackage[utf8]{inputenc}
\usepackage{amsmath}

\begin{document}

\begin{center}
\begin{math} E[\pi_{1}(s_{11}, s_{21})] = \frac{5}{6} \left(\frac{1}{2}\right) + \frac{1}{6} (-1) = \frac{1}{4} \end{math}
\end{center}

\begin{align*}
E[\pi_{1}(s_{11}, s_{22})] &= \frac{5}{6} \left(\frac{1}{2}\right) + \frac{1}{6} (-1) =\frac{1}{4} \\
E[\pi_{1}(s_{11}, s_{23})] &= \frac{5}{6} \left(\frac{5}{6} (0) + \frac{1}{6} (1)\right) + \frac{1}{6} (-1) = -\frac{1}{36} \
\end{align*}

\end{document}
hpz1719
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    This is as a result of what TeX calls \textstyle (the size of inline math) and \displaystyle (the size of display math). You can force the style to be part of your math environment. However, using \[...\] instead of \begin{center} \begin{math} ... \end{math} \end{center} does the same (and better in terms of spacing). – Werner Feb 10 '16 at 16:43
  • For a single displayed equation do \begin{equation*}<equation>\end{equation*}, not \begin{center}\begin{math}<equation>\end{math}\end{center} – egreg Feb 10 '16 at 16:44
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    Possible duplicate: Show inline math as if it were display math – Werner Feb 10 '16 at 16:44

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