A remark on the counterexample to the unknotting number conjecture
Abstract
By using Snappy, M. Brittenham and S. Hermiller discovered a very surprising example that u(71\#71)≤ 5<6=u(71)+u(71), where 71 is the (2,7)-torus knot and 71 is its mirror image. Based on their work, we give a direct verification of this fact.
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