\documentclass{article} \usepackage{mathptmx} \usepackage{tikz} %\usepackage{color} \usepackage[active,pdftex,tightpage]{preview} \PreviewEnvironment[]{tikzpicture} \DeclareSymbolFont{symbolsb}{OMS}{cmsy}{m}{n} \SetSymbolFont{symbolsb}{bold}{OMS}{cmsy}{b}{n} \DeclareSymbolFontAlphabet{\mathcal}{symbolsb} \begin{document} <> \end{document}