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Homology of Abelian Coverings of Links and Spatial Graphs

Published online by Cambridge University Press:  20 November 2018

Makoto Sakuma
Makoto Sakuma*
Affiliation:
Department of Mathematics Faculty of Science Osaka University Toyonaka, Osaka 560 Japan e-mail: sakuma@math.wani.osaka-u.ac.jp
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Abstract

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We give (1) a formula of the first Betti numbers of abelian coverings of links in terms of the Alexander ideals, (2) certain estimates of the orders of the torsion parts of their first homology groups in terms of the Alexander polynomials, and (3) a structure theorem of the first homology groups of -coverings of spatial graphs. As an application, we generalize a result of E. Hironaka on polynomial periodicity of the first Betti numbers in certain towers of abelian coverings of complex surfaces.

Keywords

57M0557M1257M25

Information

Type
Research Article
Information
Canadian Journal of Mathematics , Volume 47 , Issue 1 , 01 February 1995 , pp. 201 - 224
Copyright
Copyright © Canadian Mathematical Society 1995

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