Reidemeister-Schreier's Algorithm For 2-Coverings of Seifert Manilfolds
Geometric Topology
2014-10-01 v1
Abstract
It is classical that given any Seifert structure on N, Reidemeister-Schreier's algorithm produces a presentation of all index 2 subgroups of the fundamental group of N, described as the fundamental group of some Seifert manifolds. The new result of this article is concise formulas that gather all possible cases.
Keywords
Cite
@article{arxiv.1409.8587,
title = {Reidemeister-Schreier's Algorithm For 2-Coverings of Seifert Manilfolds},
author = {A. Bauval and C. Hayat},
journal= {arXiv preprint arXiv:1409.8587},
year = {2014}
}
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12 pages