Pages marked (R) are restricted. If you follow the link, you will be asked to type your University of Washington login and password, also known as the UWID - they need not be the same as your login and password for the Mathematics Department computer system!
The page will be displayed only if you are on the list of authorized users. If you have access problems, send a description of the problem and your UWID (login only, no password) to webmaster[_a_t_]math.washington.edu.