Mathematicians at the University of Málaga in Spain examine the subtleties of both the Cauch boundary for a generalized and possible non-symmetric distance, and the Gromov compactification for any, possibly incomplete, Finsler manifold. They also introduce the new Busemann compactification, relating it to the previous two completions, and give a full description of the causal boundary of any standard conformally stationary spacetime. Annotation ©2013 Book News, Inc., Portland, OR (booknews.com)