+-----------------------------------------------------------------------------+
|                                   preface                                   |
+-----------------------------------------------------------------------------+
 
Abbreviation:  ã|\preã%
 
Parameters:    ã|titleã%
 
    ã|Description:ã%
Each preface starts a new page,  centers the title in bold, and enters it in
the table  of contents (if  one is printed).   The preface  is not numbered.
Each heading markup can be used as often as necessary.
 
    ã|Example:ã%
\today
\preface{Acknowledgments}
I am grateful for the assistance and financial support
of the Grand Foundation for . . .
 
+-----------------------------------------------------------------------------+
|                                                                             |
|                               Acknowledgments                               |
|                                                                             |
|     I am  grateful for the assistance  and financial support  of the Grand  |
| Foundation for . . .                                                        |
|                                                                             |
+-----------------------------------------------------------------------------+
 
    ã|Notes:ã%
You  can modify  the default  style for  a  preface with  the \prefaceformat
markup.