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This book gives a comprehensive introduction to the theory of
smooth manifolds, maps, and fundamental associated structures with
an emphasis on ``bare hands'' approaches, combining
differential-topological cut-and-paste procedures and applications
of transversality. In particular, the smooth cobordism cup-product
is defined from scratch and used as the main tool in a variety of
settings. After establishing the fundamentals, the book proceeds to
a broad range of more advanced topics in differential topology,
including degree theory, the Poincare-Hopf index theorem,
bordism-characteristic numbers, and the Pontryagin-Thom
construction. Cobordism intersection forms are used to classify
compact surfaces; their quadratic enhancements are developed and
applied to studying the homotopy groups of spheres, the bordism
group of immersed surfaces in a 3-manifold, and congruences mod 16
for the signature of intersection forms of 4-manifolds. Other
topics include the high-dimensional $h$-cobordism theorem stressing
the role of the ``Whitney trick'', a determination of the singleton
bordism modules in low dimensions, and proofs of parallelizability
of orientable 3-manifolds and the Lickorish-Wallace theorem. Nash
manifolds and Nash's questions on the existence of real algebraic
models are also discussed. This book will be useful as a textbook
for beginning masters and doctoral students interested in
differential topology, who have finished a standard undergraduate
mathematics curriculum. It emphasizes an active learning approach,
and exercises are included within the text as part of the flow of
ideas. Experienced readers may use this book as a source of
alternative, constructive approaches to results commonly presented
in more advanced contexts with specialized techniques.
In recent years hyperbolic geometry has been the object and the
preparation for extensive study that has produced important and
often amazing results and also opened up new questions. The book
concerns the geometry of manifolds and in particular hyperbolic
manifolds; its aim is to provide an exposition of some fundamental
results, and to be as far as possible self-contained, complete,
detailed and unified. Since it starts from the basics and it
reaches recent developments of the theory, the book is mainly
addressed to graduate-level students approaching research, but it
will also be a helpful and ready-to-use tool to the mature
researcher. After collecting some classical material about the
geometry of the hyperbolic space and the Teichmuller space, the
book centers on the two fundamental results: Mostow's rigidity
theorem (of which a complete proof is given following Gromov and
Thurston) and Margulis' lemma. These results form the basis for the
study of the space of the hyperbolic manifolds in all dimensions
(Chabauty and geometric topology); a unified exposition is given of
Wang's theorem and the Jorgensen-Thurston theory. A large part is
devoted to the three-dimensional case: a complete and elementary
proof of the hyperbolic surgery theorem is given based on the
possibility of representing three manifolds as glued ideal
tetrahedra. The last chapter deals with some related ideas and
generalizations (bounded cohomology, flat fiber bundles, amenable
groups). This is the first book to collect this material together
from numerous scattered sources to give a detailed presentation at
a unified level accessible to novice readers."
This book provides a unified combinatorial realization of the
categroies of (closed, oriented) 3-manifolds, combed 3-manifolds,
framed 3-manifolds and spin 3-manifolds. In all four cases the
objects of the realization are finite enhanced graphs, and only
finitely many local moves have to be taken into account. These
realizations are based on the notion of branched standard spine,
introduced in the book as a combination of the notion of branched
surface with that of standard spine. The book is intended for
readers interested in low-dimensional topology, and some
familiarity with the basics is assumed. A list of questions, some
of which concerning relations with the theory of quantum
invariants, is enclosed.
Presenting some impressive recent achievements in differential
geometry and topology, this volume focuses on results obtained
using techniques based on Ricci flow. These ideas are at the core
of the study of differentiable manifolds. Several very important
open problems and conjectures come from this area and the
techniques described herein are used to face and solve some of
them. The book's four chapters are based on lectures given by
leading researchers in the field of geometric analysis and
low-dimensional geometry/topology, respectively offering an
introduction to: the differentiable sphere theorem (G. Besson), the
geometrization of 3-manifolds (M. Boileau), the singularities of
3-dimensional Ricci flows (C. Sinestrari), and Kahler-Ricci flow
(G. Tian). The lectures will be particularly valuable to young
researchers interested in differential manifolds.
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