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The Unknotting Number Is Not Additive

https://divisbyzero.com/2025/10/08/the-unknotting-number-is-not-additive/

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The Unknotting Number is Not Additive

On June 30, 2025, Mark Brittenham and Susan Hermiller uploaded a preprint to the arXiv called “Unknotting number is not additive under connected sum” (and an updated version on Septembe…

David Richeson: Division by Zero