The d-dimensional body-bar orbit framework rigidity conjecture

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Let ⟨H,m⟩ \langle H,m\rangle be a body-bar orbit framework on the fixed torus T0d \mathcal T_0^d, and let GC(Y) \mathcal G_{\mathcal C}(Y) denote the collection of connected components associated with an edge set Y Y. Body-bar orbit framework rigidity conjecture. ⟨H,m⟩ \langle H,m\rangle is a generically minimally rigid body-bar framework on T0d \mathcal T_0^d if and only if

∣E(H)∣=(d+12)∣V(H)∣−d|E(H)|={d+1\choose 2}|V(H)|-d

and, for every non-empty subset Y⊂E(H) Y\subset E(H),

∣Y∣≤(d+12)∣V(Y)∣−(d+12)+∑i=1∣GC(Y)∣(d−i).|Y|\leq {d+1\choose 2}|V(Y)|-{d+1\choose 2}+\sum_{i=1}^{|\mathcal G_{\mathcal C}(Y)|}(d-i).

This conjectures that the three-dimensional characterization proved in the paper extends to body-bar orbit frameworks in arbitrary dimension d d.

References

Primary source

Elissa Ross, “The rigidity of periodic body-bar frameworks on the three-dimensional fixed torus”, arXiv:1203.6611 (2012).

Additional references

2 papers in this index state this conjecture (2012). The statement above is taken from the most recent of them; the others are arXiv:1203.6561.

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