% qwertz TeX macros

\catcode`\"=12 
\sloppy 
\newtheorem{definition}{Definition} 
\newtheorem{proposition}{Proposition} 
\newtheorem{lemma}{Lemma} 
\newtheorem{corollary}{Corollary} 
\newtheorem{theorem}{Theorem} 
\newcommand{\mch}[1]{{\ifmmode#1 \else\(#1\)\fi}} 
\newcommand{\lt}{{\ifmmode{<}\else{\verb+<+}\fi}} 
\newcommand{\gt}{{\ifmmode{>}\else{\verb+>+}\fi}} 
\newcommand{\verbar}{{\ifmmode{|}\else{\tt|}\fi}} 
\newcommand{\idx}[1]{#1\index{#1}}
\newcommand{\cdx}[1]{#1\index{#1@{\tt #1}}}  
\newcommand{\nidx}[1]{\index{#1}}
\newcommand{\ncdx}[1]{\index{#1@{\tt #1}}}