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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…
Dave Richeson
Professor of Mathematics and the John J. Curley '60 and Ann Conser Curley '63 Faculty Chair in the Liberal Arts at Dickinson College [Icons made by Freepik from www.flaticon.com.]
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Visit divisbyzero.com → RSS feedOn Hacker News Jul 2024 – Oct 2025
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Turing's topological proof that every written alphabet is finite (2010)
Recently one of my colleagues was reading Alan Turing’s groundbreaking 1936 article “On Computable Numbers with an Application to the Entscheidungsproblem.” This is the article in…
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Make a "Magic Eye" image using Excel
I’ve been on a weird kick lately making images using Excel. [Here’s one post. I hope to post more soon.] If you add a background color to each cell in a spreadsheet and resize the cell …