Space-filling bearings in three dimensions
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We present the first space-filling bearing in three dimensions. It is shown that a packing which contains only loops with even number of spheres can be constructed in a self-similar way and that it can act as a three dimensional bearing in which spheres can rotate without slip and with negligible torsion friction.
4 pages, 4 figures, accepted for Physical Review Letters
4 pages, 4 figures, accepted for Physical Review Letters