\setlength{\oddsidemargin}{0.5in}

\makeatletter
\providecommand*{\toclevel@chap}{0}
\makeatother

\newtheorem{definition*}{Definition}
\newcommand{\D}[1]{\ensuremath{\mathrm{d}#1}}

\newcommand{\todo}[1]{\vspace{5 mm}\par \noindent
  \marginpar{\textsc{ToDo}}
  \framebox{\begin{minipage}[c]{0.95 \textwidth}
      \tt #1 \end{minipage}}\vspace{5 mm}\par}

\newcommand{\R}{\mathbf R}
\newtheorem{theorem}{Theorem}
