From the reviews: The monograph originating from lectures is devoted to the 3+1 formalism in general relativity. It starts with three chapters on basic differential geometry, the geometry of single hypersurfaces embedded in space-time, and the foliation of space-time by a family of spacelike hypersurfaces. ... With the attempt to make the text self-consistent and complete, the calculations are ... detailed such that the book is well suitable for undergraduate and graduate students. (Horst-Heino von Borzeszkowski, Zentralblatt MATH, Vol. 1254, 2013) This book is written for advanced students and researchers who wish to learn the mathematical foundations of various approaches that have been proposed to solve initial value problems (with constraints) for the Einstein equations numerically. ... Even for experts it may be useful, as it includes an extensive bibliography up to 2011. (Hans-Peter Kunzle, Mathematical Reviews, January, 2013)