Using 4D and Ribbon Concordance to Rank Knots

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Using 4D and Ribbon Concordance to Rank Knots

Postby Hugh » Sat May 21, 2022 3:32 pm

How Complex Is a Knot? New Proof Reveals Ranking System That Works.

“Ribbon concordance” will let mathematicians compare knots by linking them across four-dimensional space.

https://www.quantamagazine.org/how-complex-is-a-knot-new-proof-reveals-ranking-system-that-works-20220518/
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Re: Using 4D and Ribbon Concordance to Rank Knots

Postby PatrickPowers » Tue Jun 21, 2022 6:30 am

"Two knots are concordant if they can be connected with a type of four-dimensional cylinder."

Well, just what type of 4D cylinder is that? I suppose I could read further...
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