Knots with g(E(K)) = 2 and g(E(K#K#K)) = 6 and Morimoto's Conjecture

Details Knots with g(E(K)) = 2 and g(E(K#K#K)) = 6 and Morimoto's Conjecture Knots with g(E(K)) = 2 and g(E(K#K#K)) = 6 and Morimoto's Conjecture

2007-01-26

arxiv.org/abs/math/0701766v3

Mathematics

Geometric Topology

6 pages. Final version

Scientific paper

We show that there exist knots K in S^3 with g(E(K))=2 and g(E(K#K#K))=6. Together with Theorem~1.5 of [1], this proves existence of counterexamples to Morimoto's Conjecture (Conjecture 1.5 of [2]). This is a special case of arxiv.org/abs/math.GT/0701765 [1] Tsuyoshi Kobayashi and Yo'av Rieck. On the growth rate of the tunnel number of knots. J. Reine Angew. Math., 592:63--78, 2006. [2] Kanji Morimoto. On the super additivity of tunnel number of knots.Math. Ann., 317(3):489--508, 2000.

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