diff -r 5ae68f53b7c2 -r 8872e0776e97 src/Doc/How_to_Prove_it/ROOT
--- a/src/Doc/How_to_Prove_it/ROOT	Fri May 02 13:57:57 2014 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,9 +0,0 @@
-session How_to_Prove_it = HOL +
-  options [document = pdf, show_question_marks = false]
-  theories
-    How_to_Prove_it
-  document_files
-    "root.tex"
-    "root.bib"
-    "prelude.tex"
-