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- W2890418627 abstract "Knotted ribbons form an important topic in knot theory. They have applications in natural sciences, such as cyclic duplex DNA modeling. A flat knotted ribbon can be obtained by gently pulling a knotted ribbon tight so that it becomes flat and folded. An important problem in knot theory is to study the minimal ratio of length to width of a flat knotted ribbon. This minimal ratio is called the ribbonlength of the knot. It has been conjectured that the ribbonlength has an upper bound and a lower bound which are both linear in the crossing number of the knot. In the first part of the paper, we use grid diagrams to construct flat knotted ribbons and prove an explicit quadratic upper bound on the ribbonlength for all non-trivial knots. We then improve the quadratic upper bound to a linear upper bound for all non-trivial torus knots and twist knots. Our approach of using grid diagrams to study flat knotted ribbons is novel and can likely be used to obtain a linear upper bound for more general families of knots. In the second part of the paper, we obtain a sharper linear upper bound on the ribbonlength for nontrivial twist knots by constructing a flat knotted ribbon via folding the ribbon over itself multiple times to shorten the length." @default.
- W2890418627 created "2018-09-27" @default.
- W2890418627 creator A5029742559 @default.
- W2890418627 date "2018-09-06" @default.
- W2890418627 modified "2023-09-25" @default.
- W2890418627 title "Linear Upper Bound on the Ribbonlength of Torus Knots and Twist Knots" @default.
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- W2890418627 doi "https://doi.org/10.48550/arxiv.1809.02095" @default.
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