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Teichmuller
Theory and Applications to Geometry, Topology, and Dynamics
Volume
2: Four Theorems by William Thurston
By
John H. Hubbard
with
contributions by Adrien Douady, William Dunbar, and Roland Roeder,
as well as Sylvain Bonnot, David Brown, Allen Hatcher, Chris
Hruska, and Sudeb Mitra
Volume 1
set up the Teichmüller theory necessary for discussing Thurston's
theorems. Volume 2 proves Thurston's four theorems:
- The
classification of homeomorphisms of surfaces.
- The
topological characterization of rational maps.
- The
hyperbolization theorem for 3-manifolds that fiber over the circle.
- The
hyperbolization theorem for Haken 3-manifolds.
From
the preface to volume 1:
Not
only are the theorems of extraordinary beauty in themselves,
but the methods of proof that Thurston introduced were so novel
and displayed such amazing geometric insight that to this day
they have barely entered the accepted methods of mathematicians
in the field.
The
results sound more or less unrelated, but they are linked by
a common thread: each one goes from topology to geometry. Each
says that either a topological problem has a natural geometry,
or there is an understandable obstruction.
The
proofs are closely related: you use the topology to set up an
analytic mapping from a Teichmüller space to itself; the
geometry arises from a fixed point of this mapping. Thurston
proceeds to show that if there is no fixed point, then some system
of simple closed curves on the surface is an obstruction to finding
a solution.
Thus
the proofs of the theorems are somehow similar, although the
details and difficulty are very different....
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