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18 March 2025
 
  » arxiv » 1605.0538

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Counterexamples to the quadrisecant approximation conjecture
Sheng Bai ; Chao Wang ; Jiajun Wang ;
Date 2 May 2016
AbstractA quadrisecant of a knot is a straight line intersecting the knot at four points. If a knot has finitely many quadrisecants, one can replace each subarc between two adjacent secant points by the line segment between them to get the quadrisecant approximation of the original knot. It was conjectured that the quadrisecant approximation is always a knot with the same knot type as the original knot. We show that every knot type contains two knots, the quadrisecant approximation of one knot has self intersections while the quadrisecant approximation of the other knot is a knot with different knot type.
Source arXiv, 1605.0538
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