src/HOL/Number_Theory/document/root.tex

--- a/src/HOL/Number_Theory/document/root.tex	Thu Oct 20 11:05:16 2016 +0200
+++ b/src/HOL/Number_Theory/document/root.tex	Thu Oct 20 13:53:36 2016 +0200
@@ -1,6 +1,8 @@
 \documentclass[11pt,a4paper]{article}
 \usepackage{graphicx}
 \usepackage{isabelle,isabellesym}
+\usepackage{amssymb}
+\usepackage{amsmath}
 \usepackage{pdfsetup}
 
 \urlstyle{rm}