\documentclass[a4paper,12pt,footinclude=true,headinclude=true,oneside,dottedtoc]{scrbook}

\usepackage{amsmath, amsthm}
\usepackage[T1]{fontenc} 
% use english, does not work with classicthesis
% \usepackage{polyglossia}
% \setmainlanguage[variant=british]{english}

\usepackage[parts,drafting,eulerchapternumbers]{classicthesis}
\setcounter{tocdepth}{0} % parts, chapters

\input{preamble}

\begin{document}
% \pagenumbering{none}

\[ f \quad \frac{1}{2}f \quad \frac{1}{6}f \quad S^1_\Q = \quad X \cdots \]
\[ \xymatrix{ A \ar[rr] & & B } \]

\end{document}