diff -r e60333aa18ca -r aece5cc9efb7 src/HOL/Hoare_Parallel/document/root.tex
--- a/src/HOL/Hoare_Parallel/document/root.tex	Tue Apr 20 22:53:24 2021 +0200
+++ b/src/HOL/Hoare_Parallel/document/root.tex	Thu Apr 22 10:11:11 2021 +0200
@@ -1,6 +1,6 @@
 \documentclass[11pt,a4paper]{report}
+\usepackage[T1]{fontenc}
 \usepackage{graphicx}
-\usepackage[english]{babel}
 \usepackage{isabelle,isabellesym}
 \usepackage{pdfsetup}