\documentclass{article}
% \usepackage[czech]{babel}
% \usepackage[IL2]{fontenc}

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\usepackage{fancybox}
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\def\definice#1{
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\begin{document}

\stranka{derivace}{ \definice{The \textbf{derivative} is the limit
    $$\lim_{h\to0}\frac{f(x+h)-f(x)}h,$$ if this limit exists as a finite number.} \vyuziti{ The derivative
    has important applications in physics as a rate of change and as a
    linear approximation.}  \vypocet{The derivative can be evaluated
    using appropriate formulas}}

\stranka{hodnost}{ \definice{\textbf{Rank} is a maximal number of
    linearly independent rows in a matrix.}  \vyuziti{Rank can be used
    to prove or disprove linear independence of vectors and it also
    appears in the Frobenius Theorem.}  \vypocet{To find the rank of a
    matrix, you have to convert this matrix into row echelon form.}}

\strankaB{definition}{???}

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\end{document}