src/HOL/Number_Theory/document/root.tex

--- a/src/HOL/Number_Theory/document/root.tex	Tue Mar 09 20:00:44 2021 +0100
+++ b/src/HOL/Number_Theory/document/root.tex	Tue Mar 09 21:11:05 2021 +0100
@@ -1,4 +1,5 @@
 \documentclass[11pt,a4paper]{article}
+\usepackage[T1]{fontenc}
 \usepackage{graphicx}
 \usepackage{isabelle,isabellesym}
 \usepackage{amssymb}