National University of Singapore, 13 Computing Drive, Singapore 117417; E-mail: cyijun@nus.edu.sg ...

Max Planck Institute for Mathematics, Vivatsgasse 7, Bonn 53111, Germany To any free group automorphism, we associate a real pretree with several nice properties. First, it has a rigid/non-nesting ...

This is the only book on the subject of group theory and Einstein's theory of gravitation. It contains an extensive discussion on general relativity from the viewpoint of group theory and gauge fields ...

This textbook provides an introduction to abstract algebra for advanced undergraduate students. Based on the authors' notes at the Department of Mathematics, National Chung Cheng University, it ...