All open problems
Source labels openChecked July 26, 2026
Erdős Problem 288: I2 Card Eq 1
This is still open even if .
Mathematical statement
This is still open even if .
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_288.variants.i2_card_eq_1
Complete statement target, proof intentionally absentLean 4
theorem erdos_288.variants.i2_card_eq_1 : answer(sorry) ↔ Set.Finite { (I, n₂) : (ℕ+ × ℕ+) × ℕ+ | I.1 ≤ I.2 ∧ ∃ n : ℕ+, ∑ n₁ ∈ Set.Icc I.1 I.2, (n₁⁻¹ : ℚ) + (n₂⁻¹ : ℚ) = 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