{
  "schema_version": "1.0.0",
  "source": "vibemath",
  "problem_id": "vibemathed:erdos-966",
  "title": "Erdős Problem #966",
  "canonical_statement": "Let $k,r\\geq 2$. Does there exist a set $A\\subseteq \\mathbb{N}$ that contains no non-trivial arithmetic progression of length $k+1$, yet in any $r$-colouring of $A$ there must exist a monochromatic non-trivial arithmetic progression of length $k$? Answered in the affirmative.",
  "plain_summary": "VibeMathed reports this item as resolved. VibeMath preserves that report as a source assertion and has not independently authored a plain-language mathematical explanation.",
  "current_status": "resolved",
  "solution_events": [
    {
      "id": "vibemathed:erdos-966:event",
      "problem_id": "vibemathed:erdos-966",
      "type": "proved",
      "status": "resolved",
      "occurred_at": "2026-02-25T00:00:00.000Z",
      "title": "erdosproblems.com/966",
      "summary": "Erdős reported in 1975 that Spencer had shown existence but gave no reference; no proof was on record before the AI solution",
      "ai_contribution": "ai_discovered",
      "attempt_ids": [
        "vibemathed:erdos-966:attempt"
      ],
      "method_family_ids": [
        "vibemathed:erdos-966:method"
      ],
      "source_assertion_ids": [
        "vibemathed:erdos-966:assertion"
      ]
    }
  ],
  "attempts": [
    {
      "id": "vibemathed:erdos-966:attempt",
      "problem_id": "vibemathed:erdos-966",
      "model": "Aristotle",
      "provider": "Harmonic",
      "attempted_at": "2026-02-25T00:00:00.000Z",
      "human_collaborators": [],
      "exposure": "unknown",
      "prompt_public": null,
      "outcome": "Aristotle produced the construction and its proof and formalized the result; erdosproblems.com marks the problem PROVED with the proof verified in Lean.",
      "failed_routes": [],
      "artifacts": [],
      "sources": [
        {
          "label": "erdosproblems.com/966",
          "url": "https://www.erdosproblems.com/966",
          "kind": "primary-mathematical-source",
          "license": null
        },
        {
          "label": "VibeMathed: Erdős Problem #966",
          "url": "https://vibemathed.com/problem/erdos-966",
          "kind": "source-assertion",
          "license": "https://vibemathed.com/data-license"
        }
      ],
      "cost_usd": null,
      "independence": "unknown"
    }
  ],
  "verifications": [
    {
      "id": "vibemathed:erdos-966:verification",
      "problem_id": "vibemathed:erdos-966",
      "solution_event_id": "vibemathed:erdos-966:event",
      "level": "lean_verified_statement_audited",
      "mathematical_correctness": "supported",
      "statement_fidelity": "audited",
      "peer_review": "none",
      "verifier": "VibeMathed (source-reported label)",
      "verified_at": null,
      "note": "erdosproblems.com marks the problem PROVED (LEAN): solved in the affirmative with the proof verified in Lean.",
      "sources": [
        {
          "label": "VibeMathed: Erdős Problem #966",
          "url": "https://vibemathed.com/problem/erdos-966",
          "kind": "source-assertion",
          "license": "https://vibemathed.com/data-license"
        },
        {
          "label": "erdosproblems.com/966",
          "url": "https://www.erdosproblems.com/966",
          "kind": "primary-mathematical-source",
          "license": null
        }
      ]
    }
  ],
  "sources": [
    {
      "label": "erdosproblems.com/966",
      "url": "https://www.erdosproblems.com/966",
      "kind": "primary-mathematical-source",
      "license": null
    },
    {
      "label": "VibeMathed: Erdős Problem #966",
      "url": "https://vibemathed.com/problem/erdos-966",
      "kind": "source-assertion",
      "license": "https://vibemathed.com/data-license"
    }
  ],
  "recommended_mode": "replay",
  "recommended_exposure": "method_aware",
  "opportunity_signals": [
    {
      "id": "vibemathed:erdos-966:signal:replay_ready",
      "problem_id": "vibemathed:erdos-966",
      "kind": "replay_ready",
      "reason": "A public source and a non-unreviewed verification label support replay triage.",
      "generated_at": "2026-09-13T16:28:40.178Z"
    }
  ],
  "uncertainties": [
    "VibeMath has not independently verified the mathematical claim.",
    "AI-attempt independence and training-data exposure are unknown unless explicitly documented.",
    "VibeMath has not independently audited the mathematical statement, proof, or novelty claim."
  ],
  "generated_at": "2026-09-13T16:28:40.178Z"
}