Infinitesimal rigidity of hinged spanning cycles on the hypercube

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Let the nn-Roberts graph encode the facet adjacencies of the nn-cube, and let a hinged spanning cycle be a spanning cycle of this graph whose corresponding 2n2n facet adjacencies are retained as hinges while all other ridges are removed. Infinitesimal rigidity conjecture. All spanning cycles of the nn-Roberts graph, corresponding to hinged spanning cycles of facets on the nn-cube, produce an infinitesimally rigid structure: there is no non-trivial first-order deformation that restricts to an infinitesimal congruence on each facet. This conjecture concerns the rigidity of prefabricated hypercube structures formed by hinging facets along the edges of a spanning cycle; establishing it would explain why such structures can be transported in a folded state before unfolding after an additional cut.

References

Primary source

Kristin DeSplinter, Satyan L. Devadoss, Jordan Readyhough and Bryce Wimberly, “Unfolding cubes: nets, packings, partitions, chords”, arXiv:2007.13266 (2020).

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