The ropelength of a knot type is the birth level of its admissible deformation components, which carry a new ropelength ultrapseudometric measuring ideal merge scales.
Spaces of Knots
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abstract
We consider the space of all smooth knots in the 3-sphere isotopic to a given knot, with the aim of finding a small subspace onto which this large space deformation retracts. For torus knots and many hyperbolic knots we show the subspace can be taken to be the orbit of a single maximally symmetric placement of the knot under the action of SO(4) by rotations of the ambient 3-sphere. This would hold for all hyperbolic knots if it were known that there are no exotic free actions of a finite cyclic group on the 3-sphere. For satellite knots the situation is more complicated but still describable in fairly simple terms. (This preliminary version of the paper does not include details for the case of satellite knots.)
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math.GT 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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The Ideal Stratum and Deformation Persistence of Knot Types
The ropelength of a knot type is the birth level of its admissible deformation components, which carry a new ropelength ultrapseudometric measuring ideal merge scales.