Source labels openChecked July 26, 2026

Erdős Problem 539: Is Big O Sq

To prove erdos_539.variants.sq it suffices to show $h(n)\ll n^{1/2}$ .

Combinatorics AMS 5 AMS 11

Mathematical statement

To prove erdos_539.variants.sq it suffices to show $h(n)\ll n^{1/2}$ .

Statement source: Erdős Problems statement material

Statement terms: Source-specific

Source-specific terms. Therefore does not assert reuse rights beyond attributed display.

Statement artifacts, not proofs

These records expose exact Lean propositions and statement-only wrappers. Defining a proposition does not supply a proof of it. A placeholder-bearing target also contains no proof. Elaboration checks syntax and types; it does not certify that a formalization perfectly captures every nuance of the informal problem.

Pinned Lean formulation 1

erdos_539.variants.isBigO_sq

Canonical source

Complete statement target, proof intentionally absentLean 4

theorem erdos_539.variants.isBigO_sq :    (fun n ↦ (cofactorThreshold n : ℝ)) =O[atTop] fun n ↦ √n := by  sorry

Statement source: Formal Conjectures
Lean version: v4.27.0
Placeholder: Present; no proof artifact
Source evidence: Pinned source index
Fidelity review: Community formulation

References

Pinned Formal Conjectures sourceformalization erdosproblems.com/539background