Branched covers according to J. W. Alexander.
Mark E. Feighn (1986)
Collectanea Mathematica
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Mark E. Feighn (1986)
Collectanea Mathematica
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R. J. Daverman (1993)
Compositio 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.
Erik Hemmingsen, William Reddy (1969)
Fundamenta Mathematicae
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Luigi Grasselli, Michele Mulazzani (1999)
Disertaciones Matemáticas del Seminario de Matemáticas Fundamentales
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Tekcan, A., Bayraktar, M., Bizim, O. (2003)
Balkan Journal of Geometry and its Applications (BJGA)
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Ricardo Piergallini (1989)
Disertaciones Matemáticas del Seminario de Matemáticas Fundamentales
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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.
Iori, Massimiliano, Piergallini, Riccardo (2002)
Geometry & Topology
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Apostolakis, Nikos (2003)
Algebraic & Geometric Topology
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