% Abbreviations
\def\sys{%
${\cal S}$\kern -.08em \raise .7ex \hbox{${\cal Y}$}\kern -.25em ${\cal S}$} 
\newcommand{\vphi}{\varphi}
\newcommand{\e}{\epsilon}
\newcommand{\ol}{\overline}
\newcommand{\al}{\alpha}
\newcommand{\btu}{\bigtriangleup}
\newcommand{\txt}{\textstyle}
\newcommand{\display}{\displaystyle}
\newcommand{\go}{\longrightarrow}
\newcommand{\Go}{\Longrightarrow}
% New command on Demand
\newcommand{\qed}{\rule{3mm}{3mm}}
\newcommand{\Hajek}{H\'{a}jek }
\newcommand{\Sidak}{S\v{\i}d\'{a}k }
\newcommand{\sumnbr}{\sum_{\mbox{nbr}}}
\newcommand{\sumnonbr}{\sum_{\mbox{nonbr}}}
% New command with Parameters
\newcommand{\bm}[1]{\mbox{\boldmath{$#1$}}}
\newcommand{\dlim}[1]{ {\displaystyle \lim_{#1}} }
\newcommand{\dsum}[2]{ {\displaystyle \sum_{#1}^{#2}} }
\newcommand{\dint}[2]{ {\displaystyle \int_{#1}^{#2}} }
\newcommand{\dfrac}[2]{ \frac{\txt #1}{\txt #2} }
% Theoremlike etc.
\newtheorem{lemma}{Lemma}
\newtheorem{theorem}{Theorem}
\newtheorem{coro}{Corollary}
\newtheorem{defn}{Definition}
