{
  "schema_version": 1,
  "id": "evt-1992-metamath",
  "slug": "metamath-formal-language",
  "title": {
    "en": "Metamath establishes a minimal formal language and independently checkable proof corpus",
    "zh-CN": "Metamath 建立极简形式语言与可独立检查证明语料"
  },
  "dates": {
    "event": "1992-09-30",
    "first_public_claim": "1992-09-30",
    "paper_release": null,
    "artifact_release": "1992-09-30",
    "independently_verified": null,
    "added_to_chronicle": "2026-09-15",
    "last_updated": "2026-09-15"
  },
  "event_types": [
    "formalization",
    "infrastructure"
  ],
  "significance": {
    "tier": "H2",
    "rationale": {
      "en": "Metamath created a deliberately small formal proof language and verifier whose transparent proof objects later became a valuable substrate for neural theorem-proving systems such as Holophrasm and MetaGen.",
      "zh-CN": "Metamath 建立刻意极简的形式证明语言与验证器，其透明证明对象后来成为 Holophrasm、MetaGen 等神经定理证明系统的重要基础。"
    }
  },
  "mathematical_novelty": {
    "type": "tooling_only"
  },
  "interfaces": [
    "formal",
    "symbolic"
  ],
  "claim": {
    "en": "Metamath was developed in 1992; current official proof records retain exact contribution dates including 30 September 1992 for early corpus material, which provides the canonical historical anchor used here.",
    "zh-CN": "Metamath 于 1992 年开发；当前官方证明记录保留包括 1992 年 9 月 30 日在内的早期语料精确贡献日期，因此本条以该日期作为 canonical 历史锚点。"
  },
  "summary": {
    "en": "Metamath separates a very small verifier from explicit proof objects, allowing a large body of formal mathematics to be checked with a minimal trusted mechanism.",
    "zh-CN": "Metamath 将极小验证器与显式证明对象分离，使大型形式数学语料可以由最小可信机制进行检查。"
  },
  "why_it_matters": {
    "en": "Its transparent proof format and `set.mm` library later made Metamath attractive for machine learning, proof generation and synthetic theorem-data research.",
    "zh-CN": "其透明证明格式与 `set.mm` 数学库后来非常适合机器学习、证明生成与合成定理数据研究。"
  },
  "ai_role": {
    "level": "computation_only",
    "description": {
      "en": "The verifier mechanically checks formal proof steps; the original formal content is human-authored.",
      "zh-CN": "验证器机械检查形式证明步骤；原始形式内容主要由人类编写。"
    }
  },
  "human_contribution": {
    "description": {
      "en": "Norman Megill and contributors designed the language, verifier and formal library.",
      "zh-CN": "Norman Megill 与贡献者设计语言、验证器与形式数学库。"
    }
  },
  "systems": [
    "metamath"
  ],
  "organizations": [],
  "people": [
    "norman-megill"
  ],
  "problems": [
    "formal-mathematical-knowledge"
  ],
  "methods": [
    "proof-checking",
    "formal-proof-language",
    "mathematical-library"
  ],
  "verification": {
    "evidence_level": "E3",
    "status": "claimed",
    "formal_assurance": "artifact_available",
    "history": [
      {
        "date": "1992-09-30",
        "status": "claimed",
        "evidence_level": "E3",
        "note": {
          "en": "The live Metamath proof corpus is directly inspectable and retains historical contribution metadata for early formal content.",
          "zh-CN": "当前 Metamath 证明语料可直接检查，并保留早期形式内容的历史贡献元数据。"
        }
      }
    ]
  },
  "sources": [
    {
      "id": "metamath-early-proof-record",
      "tier": "S1",
      "type": "formal_artifact",
      "title": "Metamath Proof Explorer — early proof record",
      "url": "https://us.metamath.org/mpeuni/id1.html",
      "primary": true,
      "published_date": null,
      "accessed_at": "2026-09-15"
    }
  ],
  "artifacts": [
    {
      "id": "metamath-proof-explorer",
      "kind": "proof",
      "title": "Metamath Proof Explorer",
      "url": "https://us.metamath.org/mpeuni/mmtheorems.html"
    }
  ],
  "relationships": {
    "predecessors": [],
    "successors": [],
    "related": []
  },
  "timeline": {
    "featured": true,
    "significance": "primary"
  },
  "tags": [
    "metamath",
    "proof-checking",
    "formal-mathematics",
    "mathematical-library"
  ],
  "editorial": {
    "created_at": "2026-09-15",
    "last_reviewed": "2026-09-15",
    "reviewers": [
      "Charlie-Wang-03"
    ]
  },
  "corrections": []
}