Abstract
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.
| Original language | English |
|---|---|
| Journal | Science China Mathematics |
| DOIs | |
| State | Accepted/In press - 2026 |
Keywords
- 57K10
- 57K20
- 57K30
- Heegaard genus
- bridge-1 genus
- h-genus
- tunnel number
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