Tsit-Yuen Lam
Modules with Isomorphic Multiples and Rings with Isomorphic Matrix Rings

softbound 71 pages, 1999; 18 CHF

This monograph is a survey of n-cancellation for finitely generated projective modules and on "matrix ring" cancellation for general rings.

See the review by A.W. Chatters for Zentralblatt für Mathematik.