--- a/hws/hw04.tex	Sun Oct 27 15:16:42 2013 +0000
+++ b/hws/hw04.tex	Sun Oct 27 20:07:10 2013 +0000
@@ -18,7 +18,7 @@
 
 \item What is the language recognised by the regular expressions $(\varnothing^*)^*$.
 
-\item If a regular expression $r$ does not contain any occurrence of $\varnothing$ 
+\item If a regular expression $r$ does not contain any occurrence of $\varnothing$,  
 is it possible for $L(r)$ to be empty?
 
 \item Assume that $s^{-1}$ stands for the operation of reversing a