One of the fundamental questions of Banach space theory is whether every
Banach space has a basis. A space with a basis gives us a sense of
familiarity and concreteness, and perhaps a chance to attempt the
classification of all Banach spaces and other problems. This book
introduces the reader to some of the basic concepts, results and
applications of biorthogonal systems in infinite dimensional geometry of
Banach spaces, and in topology and nonlinear analysis in Banach spaces,
in a manner accessible to graduate students and researchers with a
foundation in Banach space theory. Numerous exercises are included, and
the only prerequisites are a basic background in functional analysis.