Problem

erdos:298

True ↔ ∀ (A : Set ℕ), 0 ∉ A → 0 < A.upperDensity → ∃ S, ↑S ⊆ A ∧ ∑ n ∈ S, 1 / ↑n = 1

Open Current State

Declared status: proved (Lean)
Formalization: formalized
Subjects: number theoryunit fractions
OEIS: N/A
Sources: source:erdos-problemssource:formal-conjecturessource:jayyhk-erdos-leansource:plby-lean-proofs
Statement: www.erdosproblems.com

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