%\input czech.sty
%\input amstex
%\documentstyle{amsppt}
%\hoffset1cm
\hoffset0.35cm
%\voffset-0.5cm
\def\ud{\char254}
\def\un{\char255}
\magnification=\magstep1
%\documentstyle{amsppt}
%\NoPageNumbers

{\catcode`\@=11\gdef\logo@{}}
\overfullrule = 0 pt

\define \epa{\rightline{\boxed{ }}}
\define \duk{{\it Důkaz. }}
\define \RR{\Bbb R}
\define \CC{\Bbb C}
\define \CCC{\Bbb C_\infty}
\define \NN{\Bbb N}
\define \QQ{\Bbb Q}
\define \ZZ{\Bbb Z}
\define \dd{\,\text{d}}
\define\grad{\operatorname{grad}}
\define\diver{\operatorname{div}}
\define\rot{\operatorname{rot}}
\define\tg{\operatorname{tg}}
\define\e{\operatorname{e}}
\define\arctg{\operatorname{arctg}}
\define\Id{\operatorname{Id}}
\define\cotg{\operatorname{cotg}}
%\define\sinh{\operatorname{sinh}}
\define\argsinh{\operatorname{argsinh}}
%\define\cosh{\operatorname{cosh}}
\define\argcosh{\operatorname{argcosh}}
\define\tgh{\operatorname{tgh}}
\define\argtgh{\operatorname{argtgh}}
\define\cotgh{\operatorname{cotgh}}
\define\argcotgh{\operatorname{argcotgh}}
\define\arccotg{\operatorname{arccotg}}
\define\Ln{\operatorname{Ln}}
\define\Arg{\operatorname{Arg}}
\define\sgn{\operatorname{sgn}}
\define\({\left(}
\define\[{\left[}
\define\){\right)}
\define\]{\right]}
\define\defin{\overset{\text{def.}}\to{=}}
\define\ozn{\overset{\text{ozn.}}\to{=}}
\let\<\langle
\let\>\rangle

\def\novyradek{\hfil
    \endgraf
    \vskip-1mm
    \noindent
    \hfil}

\def\podint#1#2{\setbox9=\hbox{\ \ $#1$\ \ }
    \begingroup
    \everymath{\ssize}
    \underset{\foldedtext\foldedwidth{\wd9}
    {\hfil#2\hfil}}\to{#1}
   \endgroup}
%\example{Příklad}
%$$\podint{\int\limits_{0}^{1}9xe^{3x}\dd x}
%{$u=9x,\ v'=e^{3x}$
%\novyradek
%$u'=9,\ v=\frac{e^{3x}}{3}$}=
%{\[ 9x\cdot\frac{e^{3x}}{3}\]}_0^1-
%3\int\limits_{0}^{1}e^{3x}\dd x
%=3e^{3x}-3{\[ \frac{e^{3x}}{3}\]}_0^1=2e^3+1.$$
%\endexample