Shadows and Branched Shadows of 3- And 4-Manifolds by Francesco Costantino
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Shadows and Branched Shadows of 3- And 4-Manifolds

Shadows and Branched Shadows of 3- And 4-Manifolds

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About the Book

The theory of shadows of 3 and 4-manifolds represents a bridge between combinatorics of polyhedra and low-dimensional topology. On the one hand, it allows a purely combinatorial approach to the study of smooth 4-manifolds and, on the other, it indicates relations between old-standing problems in group theory and recent topological results on 4-dimensional manifolds. The present Ph.D. thesis is devoted to further develop these connections and to find new applications to low-dimensional topology. The results proved, for the most part, seem to strengthen the idea that topology of 3-manifolds can be used as a guide to study the 4-dimensional case and that polyhedra can be used as a "bridge" in many cases the 4-dimensional results based on shadows restrict through the theory of spines to results about 3-dimensional topology and geometry. On the 3-dimensional side, a new notion of "shadow-complexity" of 3-manifolds is defined. The study of this complexity clarifies how hyperbolic geometry of 3-manifolds is intimately connected with the combinatorial structure of the polyhedra used to describe the manifolds. On the 4-dimensional side, the notion of branched shadow is introduced in order to study, through a purely combinatorial approach, differentiable objects as Spinc and almost complex structures on smooth 4-manifolds. Combinatorial sufficient conditions based on these objects are proved assuring that "refined" structures on 4-manifolds exist such as integrable complex structures and Stein domain structures.


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Product Details
  • ISBN-13: 9788876421549
  • Publisher: Edizioni Della Normale
  • Publisher Imprint: Edizioni Della Normale
  • Depth: 18
  • Language: English
  • Returnable: N
  • Spine Width: 18 mm
  • Width: 147 mm
  • ISBN-10: 8876421548
  • Publisher Date: 01 Oct 2005
  • Binding: Paperback
  • Height: 239 mm
  • No of Pages: 183
  • Series Title: Publications of the Scuola Normale Superiore / Theses (Scuol
  • Weight: 458 gr


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