\let\em\it
\def\N{{\Bbb N}}
\def\Z{{\Bbb Z}}
\def\Q{{\Bbb Q}}
\def\R{{\Bbb R}}
\def\C{{\Bbb C}}
\let\phi\varphi
\let\epsilon\varepsilon
\let\phy\varphi
\let\eps\varepsilon
\def\mapto#1{\mathchoice
  {\mathop{\longrightarrow}\limits^{#1}}{\mathop{\rightarrow}\limits^{#1}}
  {}{}}
\def\abs#1{\left|#1\right|}
\def\supp{\operatorname{supp}}
\def\norm#1{\left\|#1\right\|}
\def\id{\operatorname{id}}
\def\Hom{\operatorname{Hom}}
\def\Ext{\operatorname{Ext}}
\def\im{\operatorname{im}}
\let\del=\partial
\def\punkt{\mathord{\,\cdot\,}}
\def\etcohne#1{\mathord{\mathop{\dots}\limits^{\mathop{\wedge}\limits^#1}}}
\let\<\langle
\let\>\rangle
\def\Log{\operatorname{Log}}
\def\Re{\operatorname{Re}}
\def\Im{\operatorname{Im}}
\def\ord{\operatorname{ord}}
\def\Res{\operatorname{Res}}
\def\arc{\operatorname{arc}}
\def\O{\Cal O}
\def\Obj{\operatorname{Obj}}
%\def\Hom{\operatorname{Hom}}
\def\Tor{\operatorname{Tor}}
\def\Set{\Cal S\!\italic{et}}
\def\Top{\Cal T\!\italic{op}}
\def\pt{\roman{pt}}
