4--manifolds as covers of the 4--sphere branched over non-singular surfaces.
Iori, Massimiliano, Piergallini, Riccardo (2002)
Geometry & Topology
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Iori, Massimiliano, Piergallini, Riccardo (2002)
Geometry & Topology
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Ricardo Piergallini (1989)
Disertaciones Matemáticas del Seminario de Matemáticas Fundamentales
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Mark E. Feighn (1986)
Collectanea Mathematica
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José María Montesinos-Amilibia (2002)
Revista Matemática Complutense
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It is proved that the Freudenthal compactification of an open, connected, oriented 3-manifold is a 3-fold branched covering of S, and in some cases, a 2-fold branched covering of S. The branching set is a locally finite disjoint union of strings.
Sang-Eon Han (2010)
International Journal of Applied Mathematics and Computer Science
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In order to classify digital spaces in terms of digital-homotopic theoretical tools, a recent paper by Han (2006b) (see also the works of Boxer and Karaca (2008) as well as Han (2007b)) established the notion of regular covering space from the viewpoint of digital covering theory and studied an automorphism group (or Deck's discrete transformation group) of a digital covering. By using these tools, we can calculate digital fundamental groups of some digital spaces and classify digital...
Karol Borsuk, Rimas Vaina (1979)
Colloquium Mathematicae
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Rastislav Telgársky (1976)
Colloquium Mathematicae
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Maria Rita Casali (1992)
Revista Matemática de la Universidad Complutense de Madrid
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In this work, we prove that every closed, orientable 3-manifold M which is a two-fold covering of S branched over a link, has type six.
Dumitrescu, Adrian, Jiang, Minghui (2010)
Beiträge zur Algebra und Geometrie
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Apostolakis, Nikos (2003)
Algebraic & Geometric Topology
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