\usepackage{xcolor}
\usepackage[sc]{mathpazo}
\usepackage{fontspec}
\setmainfont[Ligatures=TeX]{Palatino Linotype}
\usepackage{amssymb}
\usepackage{amsmath}
%%\usepackage{menukeys}

\definecolor{darkblue}{rgb}{0,0,0.6}
\usepackage[colorlinks=true,urlcolor=darkblue,linkcolor=darkblue]{hyperref}

\newcommand{\ZERO}{\mbox{\bf 0}}
\newcommand{\ONE}{\mbox{\bf 1}}
\newcommand{\Left}{\textit{Left}}
\newcommand{\Der}{\textit{Der}}
\newcommand{\der}{\textit{der}}
\newcommand{\Ders}{\textit{Ders}}
\newcommand{\ders}{\textit{ders}}

%%% for trees
%% http://anorien.csc.warwick.ac.uk/mirrors/CTAN/graphics/pgf/contrib/forest/forest.pdf

\newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}
\newcommand{\defn}[1]{\textit{\textbf{#1}}}
\newcommand{\dq}[1]{\mbox{\tt{"}}#1\mbox{\tt{"}}}

\definecolor{codegray}{gray}{0.9}

\makeatletter
\def\fnote{\gdef\@thefnmark{}\@footnotetext}
\makeatother