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The \texttt{cernrep} class loads, amongst others, the \texttt{amsmath}  and the \texttt{amssymb} packages. The latter package defines many  supplementary commands and symbols that with \TeX{} would have to be  constructed from more basic components. See \Refs~\cite{bib:voss2005} \cite{bib:voss2005}  and \cite{bib:pakin2003}, or Chapter~8 of~\Bref{bib:mittelbach2004} of \cite{bib:mittelbach2004}  for more details.