Geometry has fascinated philosophers since the days of Thales and
Pythagoras. In the 17th and 18th centuries it provided a paradigm of
knowledge after which some thinkers tried to pattern their own
metaphysical systems. But after the discovery of non-Euclidean
geometries in the 19th century, the nature and scope of geometry became
a bone of contention. Philosophical concern with geometry increased in
the 1920's after Einstein used Riemannian geometry in his theory of
gravitation. During the last fifteen or twenty years, renewed interest
in the latter theory -prompted by advances in cosmology -has brought
geometry once again to the forefront of philosophical discussion. The
issues at stake in the current epistemological debate about geometry can
only be understood in the light of history, and, in fact, most recent
works on the subject include historical material. In this book, I try to
give a selective critical survey of modern philosophy of geometry during
its seminal period, which can be said to have begun shortly after 1850
with Riemann's generalized conception of space and to achieve some sort
of completion at the turn of the century with Hilbert's axiomatics and
Poincare's conventionalism. The philosophy of geometry of Einstein and
his contemporaries will be the subject of another book. The book is
divided into four chapters. Chapter 1 provides back- ground information
about the history of science and philosophy.