Alternating links and left-orderability
classification
🧮 math.GT
math.GR
keywords
alternatingsigmaadmitsboyer-gordon-watsonbrancheddenotedouble-coverfact
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Let L \subset S^3 denote an alternating link and Sigma(L) its branched double-cover. We give a short proof of the fact that the fundamental group of Sigma(L) admits a left-ordering iff L is an unlink. This result is originally due to Boyer-Gordon-Watson.
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