ccc-Autoevolutes.
2021
ccc-Autoevolutes are closed constant curvature space curves which are their own evolutes. A modified Frenet equation produces constant curvature curves such that the curve on $[0, \pi]$ is congruent to the evolute on $[\pi, 2\pi]$ and vice versa. Closed curves are then congruent to their evolutes. If the ruled surface spanned by the principal normals between curve and evolute is a M\"obius band then the curve is its own evolute. We use symmetries to construct closed curves by solving 2-parameter problems numerically. The smallest autoevolute which we found is a trefoil knot parametrized by three periods $[0, 6\pi]$.Our smallest closed solution of the ODE is parametrized by two periods.
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