TTT now available free

Toposes, Triples and Theories, by Michael Barr and Charles Wells, was published in 1984 by Springer-Verlag as Grundlehren der mathematischen Wissenschaften 278. That version is now out of print. We have retrieved the copyright and have placed a corrected and somewhat expanded version of the book on line, by ftp at ftp.math.mcgill.ca in the files pub/barr/tttdvi.zip pub/barr/tttpdf.zip pub/barr/tttps.zip and by browser from the location http://www.cwru.edu/artsci/math/wells/pub/ttt.html --Michael Barr and Charles Wells