The one-point deletion conjecture for planar point configurations

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Let P,Q∈R2P,Q\in\mathbb{R}^2 be two nn-point configurations with equal distance distributions DP=DQD_P=D_Q. Assume the points are labelled appropriately, and suppose there do not exist A∈O(2)A\in O(2) and t⃗∈R2\vec{t}\in\mathbb{R}^2 such that

Q=AP+t⃗.Q=AP+\vec{t}.

One-point deletion conjecture. There exist pi∈Pp_i\in P and qi∈Qq_i\in Q, together with some A∈O(2)A\in O(2) and t⃗∈R2\vec{t}\in\mathbb{R}^2, such that

Q\qi=A(P\pi)+t⃗.Q\backslash q_i=A(P\backslash p_i)+\vec{t}.

The conjecture asserts that two noncongruent planar configurations with the same distribution of pairwise distances can be made congruent by deleting one point from each configuration. The surrounding examples motivate the claim, but the supplied text gives no resolution.

References

Primary source

Neophytos Charalambides, Steven B. Damelin and Bradley Swartz, “Isometries and Equivalences Between Point Configurations, Extended To -diffeomorphisms”, arXiv:1705.06146 (2021).

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