Source labels openChecked July 26, 2026

Erdős Problem 812: I

Is it true that $\frac{R(n+1)}{R(n)}\geq 1+c$ for some constant $c>0$ , for all large $n$ ?

Combinatorics AMS 5

Mathematical statement

Is it true that $\frac{R(n+1)}{R(n)}\geq 1+c$ for some constant $c>0$ , for all large $n$ ?

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_812.parts.i

Canonical source

Complete statement target, proof intentionally absentLean 4

theorem erdos_812.parts.i :    answer(sorry) ↔ ∃ c > 0, ∀ᶠ n in atTop, (R (n + 1) : ℝ) / (R n : ℝ) ≥ 1 + c:= 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/812background