--- a/handouts/ho08.tex	Tue Sep 26 14:07:29 2017 +0100
+++ b/handouts/ho08.tex	Tue Sep 26 14:08:49 2017 +0100
@@ -8,6 +8,10 @@
 % modern compilers are different
 % https://channel9.msdn.com/Blogs/Seth-Juarez/Anders-Hejlsberg-on-Modern-Compiler-Construction
 
+%halting problem
+%https://dfilaretti.github.io/2017-04-30/halting-problem
+
+
 \begin{document}
 \lstset{morekeywords={def,if,then,else,write,read},keywordstyle=\color{codepurple}\bfseries}