@itemize @bullet
@item
-Problem 1-4, the advanced scheduler. We must be able to turn this on
+Problem 1-3, the advanced scheduler. We must be able to turn this on
and off with a compile-time directive. You must use the macro name we
-specify for that part. @xref{Problem 1-4 Advanced Scheduler}, for
+specify for that part. @xref{Problem 1-3 Advanced Scheduler}, for
details.
@item