This is an collection of some easily-formulated problems that remain
open in the study of the geometry and analysis of Banach spaces.
Assuming the reader has a working familiarity with the basic results of
Banach space theory, the authors focus on concepts of basic linear
geometry, convexity, approximation, optimization, differentiability,
renormings, weak compact generating, Schauder bases and biorthogonal
systems, fixed points, topology and nonlinear geometry.
The main purpose of this work is to help in convincing young researchers
in Functional Analysis that the theory of Banach spaces is a fertile
field of research, full of interesting open problems. Inside the Banach
space area, the text should help expose young researchers to the depth
and breadth of the work that remains, and to provide the perspective
necessary to choose a direction for further study.
Some of the problems are longstanding open problems, some are recent,
some are more important and some are only local problems. Some would
require new ideas, some may be resolved with only a subtle combination
of known facts. Regardless of their origin or longevity, each of these
problems documents the need for further research in this area.