Our purpose and main concern in writing this book is to illuminate
classical concepts from the noncommutative viewpoint, to make the
language and techniques of noncommutative geometry accessible and
familiar to practi- tioners of classical mathematics, and to benefit
physicists interested in the uses of noncommutative spaces. Same may say
that ours is a very "com- mutative" way to deal with noncommutative
matters; this charge we readily admit. Noncommutative geometry amounts
to a program of unification of math- ematics under the aegis of the
quantum apparatus, i.e., the theory of ope- rators and of C*-algebras.
Largely the creation of a single person, Alain Connes, noncommutative
geometry is just coming of age as the new century opens. The bible of
the subject is, and will remain, Connes' Noncommuta- tive Geometry
(1994), itself the "3.8-fold expansion" of the French Geome- trie non
commutative ( 1990). Theseare extraordinary books, a "tapestry" of
physics and mathematics, in the words of Vaughan jones, and the work of
a "poet of modern science," according to Daniel Kastler, replete with
subtle knowledge and insights apt to inspire several generations.