"Chapters'' that appear before the first chapter of the book are given negative numbers. The macros treat such chapters somewhat differently than ordinary chapters (for example, they are not referred to by number).
Just before the first such chapter, include something like this:
\chapnum=-2
if you have two such chapters, perhaps a preface and a table
of contents. In general,
set \chapnum
to the negative of the number of prefatory chapters
you have—for example, if you have only a table of contents, set
\chapnum=-1
, and if you have preface, brief contents and
contents, set \chapnum=-3
. Then use the \chapter
command
just as you would for an ordinary chapter, for example
\chapter{Preface}{}
.