This book is intended for graduate students and research mathematicians interested in topological groups, Lie groups, category theory, and homological algebra.

In this paper the authors develop homotopy theoretical methods for studying diagrams. In particular they explain how to construct homotopy colimits and limits i

This work is intended for graduate students and research mathematicians interested in differential geometry and partial differential equations.

This book is intended for graduate students and research mathematicians interested in associative rings and algebras, and noncommutative geometry.

Intersection homology theory provides a way to obtain generalized Poincare duality, as well as a signature and characteristic classes, for singular spaces. For