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Erdős problem 94

Suppose nn points in R2\mathbb{R}^2 determine a convex polygon and the set of distances between them is {u1,…,ut}\{u_1,\ldots,u_t\}. Suppose uiu_i appears as the distance between f(ui)f(u_i) many pairs of points. Then ∑if(ui)2≪n3.\sum_i f(u_i)^2 \ll n^3.

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