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- W2023254158 abstract "A new type of knot energy is presented via real life experiments involving a thin resilient metallic tube. Knotted in different ways, the device mechanically acquires a uniquely determined (up to isometry) normal form at least when the original knot diagram has a small number of crossings, thus outperforming the famous Mobius energy due to Jun O'Hara and studied by Michael Freedman et al. Various properties of the device are described (under certain conditions it does the Reidemeister and Markov moves, it beautifully performs the Whitney trick by uniformizing its own local curvature). If the device is constrained between two parallel planes (e.g. glass panes), it yields a real life model of a flat knot (class of knot diagrams equivalent under Reidemeister $Omega_2$ and $Omega_3$ moves) also leading to uniquely determined flat normal forms (for a small number of crossing points of the given flat knot diagram). The paper concludes with two mathematical theorems, one reducing the knot recognition problem to the flat knot recognition problem, the other (due to S.V.Matveev) giving an easily computable complete system of invariants for the flat unknot knot equivalence problem." @default.
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- W2023254158 date "2011-06-01" @default.
- W2023254158 modified "2023-10-10" @default.
- W2023254158 title "Mechanical normal forms of knots and flat knots" @default.
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- W2023254158 doi "https://doi.org/10.1134/s1061920811020105" @default.
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