\documentclass{report}

\usepackage{amssymb}
\usepackage{times,mathptmx}
\DeclareMathAlphabet{\mathcal}{OMS}{cmsy}{m}{n}
\usepackage{amsmath}
\usepackage{epsfig}
\usepackage{color}

\begin{document}
\pagestyle{empty}
\input{$f.pstex_t}
\end{document}