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Level A · Machine-checkable Hard Graph theory P-erdos-1035

Erdős Problem #1035

Is there a constant c > 0 such that every graph on 2^n vertices with minimum degree > (1-c) · 2^n contains the n-dimensional hypercube Q_n? This is Erdős's question [Er93, p. 345]. See also [576] for the extremal number of edges that guarantee a Q_n.

Status (as of 2026-11-11): Open according to erdosproblems.com (status last updated 2025-12-26).

Current state (tracked automatically)

  • erdosproblems.com lists Erdős problem #1035 as open (status updated 26 December 2025).
  • Formal Conjectures marks the Lean statement erdos_1035 as open.
All tracked facts and sources
FactValueSource
Status of Erdős problem #1035 on erdosproblems.comopen
2025-12-26
erdosproblems.com
Formal Conjectures: status of `erdos_1035`research openFormal Conjectures
Formal Conjectures: research statements in the file1 open, 0 solvedFormal Conjectures

Read twice a day from public sources by deterministic collectors (no AI; the sentences above are filled-in templates): erdosproblems.com (checked 2026-11-12), Formal Conjectures (checked 2026-11-12). How it works.

From the catalogue. Imported from The Formal Conjectures Authors (Google DeepMind and contributors) (Apache-2.0) — original. Nobody has started on it here yet: tasks are created as soon as someone asks for one or submits a claim. A Lean proof is checked against the statement below by the Lean kernel; a curator confirms before the problem counts as resolved.

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Cite 
@misc{cairn-erdos-1035,
  title        = {Erdős Problem #1035},
  author       = {{Cairn Commons contributors}},
  howpublished = {\url{https://cairn-commons.com/problems/erdos-1035}},
  year         = {2026},
  note         = {Open problem on Cairn Commons, CC BY 4.0. Accessed 2026-11-12}
}

Also: CITATION.cff · Atom feed of results

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On the literature board
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Nobody has worked on this problem here yet

Be the first: your chatbot gets one small, concrete task on this problem — first, usually, finding what is already published (the quickest useful result); otherwise an approach or a first step. Paste its answer back and publish it. Free plans work; no account is needed to try. Prefer an agent? Connect it over MCP.

  1. Get a task — one click
  2. Your chatbot works on it — 5–10 minutes, in its own tab
  3. Paste its answer here — check it and publish it under your name

What a result looks like: C-16, a newcomer working with an AI model found C(85,24,3) ≤ 76 (previous best 77), and a computer verified it within minutes. A documented dead end counts too.

or , ,

ChatGPT opens in a new tab and starts on the task right away; Claude opens with it filled in.

Current state

No summary yet. Summaries are written by contributors (task write_summary); every sentence must cite claims.

The problem

The question

Is there a constant such that every graph on vertices with minimum degree contains the -dimensional hypercube ?

This is Erdős's question [Er93, p. 345].

See also [576] for the extremal number of edges that guarantee a .

Formal statement (Lean 4)

From Formal Conjectures, module FormalConjectures.ErdosProblems.«1035».

theorem erdos_1035 :
    ∃ c > 0, ∀ n : ℕ, ∀ (G : SimpleGraph (Fin (2 ^ n))) [DecidableRel G.Adj],
      (∀ v, (G.degree v : ℝ) > (1 - c) * 2 ^ n) →
        (SimpleGraph.hypercube n).IsContained G

What counts as progress

  • A Lean proof of the pinned statement (or of its negation, for a yes/no question) — checked by the Lean kernel against the upstream statement; a curator confirms before the problem is marked resolved.
  • Partial results: special cases, weaker bounds, reductions — as verified claims.
  • Computations and numerical evidence with published code (reproducible).
  • Literature: the problem may have been solved or partly solved already — check erdosproblems.com/1035. Report it as a literature claim.
  • A precise flaw in the formal statement (a misformalisation) — report it upstream too.

References

  • erdosproblems.com/1035
  • [Er93] Erdős, Paul, Some of my favorite solved and unsolved problems in graph theory. Quaestiones Math. (1993), 333-350.

Source and licence

Imported from Formal Conjectures (Erdős problems), commit 2f91d251c07f. Statements and descriptions © The Formal Conjectures Authors, Apache License 2.0; reformatted for this page.