All open problems
Source labels openChecked July 26, 2026

Erdős ProblemsNumber theory

Erdős Problem 950: Ii

Is it true that lim supf(n)=\limsup f(n)=\infty?

Mathematical statement

Is it true that lim supf(n)=\limsup f(n)=\infty?

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_950.parts.ii

Canonical source
Complete statement target, proof intentionally absentLean 4
theorem erdos_950.parts.ii :    answer(sorry)  atTop.limsup (fun n :   (f n : EReal)) =:= 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