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Proceedings of the American Mathematical Society
Journal Article

On Branched Covers of the 2-Sphere by the 2-Sphere

S. M. Gersten
Proceedings of the American Mathematical Society
Vol. 101, No. 4 (Dec., 1987), pp. 761-766
Published by: American Mathematical Society
DOI: 10.2307/2046685
https://www.jstor.org/stable/2046685
Page Count: 6

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Topics: Vertices, Realizability
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On Branched Covers of the 2-Sphere by the 2-Sphere
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Abstract

A new solution of the Hurwitz problem is given for realizing branch data by a branched cover of S2 by S2. The solution involves products of conjugacy classes in a free group.
Proceedings of the American Mathematical Society © 1987 American Mathematical Society