Let $A \subset R^{2}$ be a set of $n$ points such that any subset of size $4$ determines at least $5$ distinct distances. Must $A$ determine $≫ n^{2}$ many distances?

Worked, still open.

distances · solved · prize $250 · possible · 0 attempts

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vela registry pull vfr_37aec80d874a0239

vela reproduce examples/erdos-problems

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