Erdős Problem a Daythe open tracker

Erdős Problem #1086

OPENdatabase updated 2025-10-17

No proof or disproof is known, and it isn't known whether a finite computation could settle it.

What the community database records, not our verdict. erdosproblems.com no longer shows statuses (why).

The number of triangles with vertices in `P` and area `a`: the `3`-element subsets of `P` whose vertices `p, q, r` satisfy `|triangle_area p q r| = a`.

\(g(n)\): the maximum, over all sets of \(n\) points in the plane and all areas \(a > 0\), of the number of triangles of area \(a\) with vertices in the set. Only positive areas count, since every collinear triple has area \(0\). The set of values is nonempty and bounded by \(\binom{n}{3}\), so `sSup` is a true maximum.

Let \(g(n)\) be minimal such that any set of \(n\) points in \(\mathbb{R}^2\) contains the vertices of at most \(g(n)\) many triangles with the same area. Estimate \(g(n)\). Only triangles of positive area are counted.
Statement as formalized in Formal Conjectures (Google DeepMind, Apache-2.0) · their label: research open · 2 further variants / known partial results in the Lean file. The authoritative wording is on erdosproblems.com/1086.
Prizenone
Topicsgeometry, distances
Statement in LeanFormal Conjectures
Solution in Leanno
Original pageerdosproblems.com/1086
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