Characteristic classes are central to the modern study of the
topology and geometry of manifolds. They were first introduced in
topology, where, for instance, they could be used to define
obstructions to the existence of certain fiber bundles.
Characteristic classes were later defined (via the Chern-Weil
theory) using connections on vector bundles, thus revealing their
geometric side. In the late 1960s new theories arose that described
still finer structures.Examples of the so-called secondary
characteristic classes came from Chern-Simons invariants,
Gelfand-Fuks cohomology, and the characteristic classes of flat
bundles. The new techniques are particularly useful for the study
of fiber bundles whose structure groups are not finite dimensional.
The theory of characteristic classes of surface bundles is perhaps
the most developed. Here the special geometry of surfaces allows
one to connect this theory to the theory of moduli space of Riemann
surfaces, i.e., Teichmuller theory. In this book Morita presents an
introduction to the modern theories of characteristic classes.
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