--- a/hws/hw02.tex	Sat Oct 03 00:51:47 2020 +0100
+++ b/hws/hw02.tex	Sat Oct 03 15:21:06 2020 +0100
@@ -48,15 +48,7 @@
       Compute what the derivative of $r$ is with respect to
       $a$, $b$ and $c$. Is $r$ nullable?
 
-\item Prove that for all regular expressions $r$ we have
-      
-\begin{center} 
-  $\textit{nullable}(r) \quad \text{if and only if} 
-  \quad [] \in L(r)$ 
-\end{center}
-
-      Write down clearly in each case what you need to prove
-      and what are the assumptions. 
+\item (Moved to HW3)
   
 \item Define what is meant by the derivative of a regular
       expressions with respect to a character. (Hint: The