1 “...This graduate textbook presents a concrete and up-to-date introduction to the theory of Coxeter...”

2 Table of Contents: “... ; Canonical theories ; Algebraic functors ; Birkhoff's variety theorem -- Concrete algebraic categories. One...”

3 “... to the frontiers of current research at the time of publication. The treatment is concrete and combinatorial with a...”

4 “.... However, other foundational aspects of the subject are developed. These results give concrete...”

5 “... concrete problems such as vector bundles on curves will find this to be a valuable resource. Amongst other...”

6 “... at geometers, topologists and operator algebraists, this book takes a friendly and concrete approach...”

7 “... variants and improvements. Complete with concrete examples and computations throughout, and a list of open...”

8 “... and constructions of categorical and geometric quotients. Throughout, the emphasis is on concrete examples which...”

9 “.... It contains concrete examples and many exercises (ranging from the relatively simple to the much more complex...”

10 “... and the metric geometry of locally compact groups. Concrete examples, including groups acting on trees...”

11 “.... However, as topology is usually taught, even the first, more concrete type of problem is approached using...”

12 “... the presentation as concrete as possible. So the general theory is applied to Stanley-Reisner rings, semigroup...”

13 “... the standard concept of probabilistic independence to non-commuting random variables. Concretely worked out...”