This book is an introduction to the theory of stable commutator length and the related subjects of quasimorphisms and bounded cohomology.


The book was published by the Mathematical Society of Japan in June 2009 as volume 20 in their MSJ Memoirs series. The .pdf is available for download here with their permission, although I encourage you to buy a physical copy if you find this version useful.

Download .pdf

Associated software (including scallop) can be downloaded from Alden Walker's GitHub page.

Zentralblatt MATH review by Athanase Papadopoulos

MathSciNet review by Athanase Papadopoulos