The one-point deletion conjecture for planar point configurations

Let P,QR2P,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 AO(2)A\in O(2) and tR2\vec{t}\in\mathbb{R}^2 such that

Q=AP+t.Q=AP+\vec{t}.

One-point deletion conjecture. There exist piPp_i\in P and qiQq_i\in Q, together with some AO(2)A\in O(2) and tR2\vec{t}\in\mathbb{R}^2, such that

Q\qi=A(P\pi)+t.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.

Sources & referencesView supporting material

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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