Dear authors, the login to the old AOP textbook editor has been disabled. Please log in at the new SAOP textbook site now if you wish to work on the textbook contents.

Dear readers, the AOP project has now advanced to the SAOP project and the textbook as well as other information are accessible through our website at www.surayt.com. If for whatever reason, you still wish to make use of the legacy online textbook, you can do so via the links below. Please do note, however, that these versions of the textbook are now deprecated and may not continue to function indefinitely.