Problem packetResearch packetR1234
Current status and unresolved remainder
Link to a section
The record cites sources for its explanation.
Recorded status: reported
Recorded scope: No scope is recorded.
Originating problem: The limit of the minimum overlap quotient
Authored record and scope
- Authored title
- Current status and unresolved remainder
- Record type
- claim
- Stored status
- reported
- Evidence grade
- sourced
2Authored explanation
OPEN as of 2026-07-31. The maintained Erdős Problems database at commit 8138974387d9030542daabe67faaa33eff9356f8 lists Problem 36 as open. The unresolved remainder is the full displayed statement.
A complete resolution must satisfy this condition: Give a rigorous proof or counterexample that completely resolves this statement: Erdős Problem 36: For each positive integer $n$, consider all partitions of $\{1, 2, \dots, 2n\}$ into two disjoint $n$-element subsets $A$ and $B$. For integers $a \in A$ and $b \in B$, define the overlap of $A$ and $B$ at difference $k \in \mathbb{Z}$ to be the number of pairs $(a,b)$ with $a - b = k$. Define the maximum overlap $M(A,B)$ to be the largest overlap over all integer differences $k$. Define $M(n)$ to be the minimum of $M(A,B)$ over all such partitions $(A,B)$. Define the minimum overlap quotient by \[Q(n) = \frac{M(n)}{n}.\] Does the limit $\displaystyle\lim_{n \to \infty} Q(n)$ exist, and if so, what is its exact value?
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Replay material: source only
3Evidence
A verification source is cited. This record has no executable replay attached.
Verification source: www.erdosproblems.com ↗, See dataset.references[0] for the exact external source and locator.
4How it connects
Addressed by
- attempt
Recorded for
- problem
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Cite the original sources separately.
Machine-readable record
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"summary": "OPEN as of 2026-07-31. The maintained Erdős Problems database at commit 8138974387d9030542daabe67faaa33eff9356f8 lists Problem 36 as open. The unresolved remainder is the full displayed statement. Give a rigorous proof or counterexample that completely resolves this statement: Erdős Problem 36: For each positive integer $n$, consider all partitions of $\\{1, 2, \\dots, 2n\\}$ into two disjoint $n$-element subsets $A$ and $B$. For integers $a \\in A$ and $b \\in B$, define the overlap of $A$ and $B$ at difference $k \\in \\mathbb{Z}$ to be the number of pairs $(a,b)$ with $a - b = k$. Define the maximum overlap $M(A,B)$ to be the largest overlap over all integer differences $k$. Define $M(n)$ to be the minimum of $M(A,B)$ over all such partitions $(A,B)$. Define the minimum overlap quotient by\n\\[Q(n) = \\frac{M(n)}{n}.\\]\nDoes the limit $\\displaystyle\\lim_{n \\to \\infty} Q(n)$ exist, and if so, what is its exact value?",
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"body": "OPEN as of 2026-07-31. The maintained Erdős Problems database at commit 8138974387d9030542daabe67faaa33eff9356f8 lists Problem 36 as open. The unresolved remainder is the full displayed statement.\n\nA complete resolution must satisfy this condition: Give a rigorous proof or counterexample that completely resolves this statement: Erdős Problem 36: For each positive integer $n$, consider all partitions of $\\{1, 2, \\dots, 2n\\}$ into two disjoint $n$-element subsets $A$ and $B$. For integers $a \\in A$ and $b \\in B$, define the overlap of $A$ and $B$ at difference $k \\in \\mathbb{Z}$ to be the number of pairs $(a,b)$ with $a - b = k$. Define the maximum overlap $M(A,B)$ to be the largest overlap over all integer differences $k$. Define $M(n)$ to be the minimum of $M(A,B)$ over all such partitions $(A,B)$. Define the minimum overlap quotient by\n\\[Q(n) = \\frac{M(n)}{n}.\\]\nDoes the limit $\\displaystyle\\lim_{n \\to \\infty} Q(n)$ exist, and if so, what is its exact value?",
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View source, identifiers, and projection details
A statement this project treats as settled at the recorded evidence grade, with the work that backs it.