hws/hw02.tex
changeset 768 34f77b976b88
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    60   
    60   
    61 \item Define what is meant by the derivative of a regular
    61 \item Define what is meant by the derivative of a regular
    62       expressions with respect to a character. (Hint: The
    62       expressions with respect to a character. (Hint: The
    63       derivative is defined recursively.)
    63       derivative is defined recursively.)
    64 
    64 
    65 \item Assume the set $Der$ is defined as
    65 \item  Assume the set $Der$ is defined as
    66 
    66 
    67   \begin{center}
    67   \begin{center}
    68     $Der\,c\,A \dn \{ s \;|\;  c\!::\!s \in A\}$
    68     $Der\,c\,A \dn \{ s \;|\;  c\!::\!s \in A\}$
    69   \end{center}
    69   \end{center}
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    70