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Comparing h-genera, bridge-1 genera and Heegaard genera of knots

  • East China Normal University

科研成果: 期刊稿件文章同行评审

摘要

Let h(K), g1(K), gH(K) and t(K) be the h-genus, bridge-1 genus, Heegaard genus and tunnel number of a knot K in the 3-sphere S3, respectively. It is known that gH(K) − 1 = t(K) ⩽ g1(K) ⩽ h(K) ⩽ gH(K). Then a natural question arises: under what conditions do the h-genus, bridge-1 genus, Heegaard genus and tunnel number of a knot become equal? We provide the necessary and sufficient conditions for those equalities and use these to show that for each integer n ⩾ 1, there are infinitely many knots in each of the following three families (Formula presented.) This resolves a conjecture by Morimoto (2005) that each of these families is nonempty.

源语言英语
期刊Science China Mathematics
DOI
出版状态已接受/待刊 - 2026

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