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arxiv: math/9712205 · v2 · submitted 1997-12-01 · 🧮 math.GT

Quadrisecants of knots and links

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keywords mustnon-trivialquadrisecantalgebraicapplicationcollineardegreeeight
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We show that every non-trivial tame knot or link in R^3 has a quadrisecant, i.e. four collinear points. The quadrisecant must be topologically non-trivial in a precise sense. As an application, we show that a nonsingular, algebraic surface in R^3 which is a knotted torus must have degree at least eight.

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