{
  "schema_version": 1,
  "id": "evt-1988-isabelle",
  "slug": "isabelle-generic-theorem-prover",
  "title": {
    "en": "Isabelle develops a generic theorem-proving framework across object logics",
    "zh-CN": "Isabelle 建立跨对象逻辑的通用定理证明框架"
  },
  "dates": {
    "event": "1988-05-23",
    "first_public_claim": null,
    "paper_release": "1988-05-23",
    "artifact_release": null,
    "independently_verified": null,
    "added_to_chronicle": "2026-09-15",
    "last_updated": "2026-09-15"
  },
  "event_types": [
    "formalization",
    "system",
    "infrastructure"
  ],
  "significance": {
    "tier": "H2",
    "rationale": {
      "en": "Isabelle generalized the LCF tradition into a theorem-proving framework supporting multiple object logics and substantial tactic automation, later becoming a major platform for formal mathematics and AI-assisted proving.",
      "zh-CN": "Isabelle 将 LCF 传统发展为支持多种对象逻辑与丰富 tactic 自动化的通用定理证明框架，后来成为形式数学与 AI 辅助证明的重要平台。"
    }
  },
  "mathematical_novelty": {
    "type": "tooling_only"
  },
  "interfaces": [
    "formal",
    "symbolic"
  ],
  "claim": {
    "en": "Isabelle was first made publicly available in 1986; Paulson's CADE-9 system abstract on 23 May 1988 provides the precise public research anchor used for this canonical Event date.",
    "zh-CN": "Isabelle 于 1986 年首次公开；Paulson 在 1988 年 5 月 23 日 CADE-9 的系统摘要为本 canonical Event 提供精确公开研究时间锚点。"
  },
  "summary": {
    "en": "Isabelle used higher-order unification and a generic meta-level architecture to encode and reason within several object logics, with tactics and tacticals providing automation.",
    "zh-CN": "Isabelle 利用高阶合一与通用元逻辑架构编码多种对象逻辑，并通过 tactics 与 tacticals 提供自动化。"
  },
  "why_it_matters": {
    "en": "Isabelle later supported major formal verification projects and created the environment in which Sledgehammer and other ATP/ML integrations matured.",
    "zh-CN": "Isabelle 后来承载大型形式验证工程，并成为 Sledgehammer 等 ATP/ML 融合系统发展的关键环境。"
  },
  "ai_role": {
    "level": "human_ai_collaboration",
    "description": {
      "en": "Users supplied formal goals and guidance while the system executed logical inference, unification and tactic automation.",
      "zh-CN": "用户提供形式目标与指导，系统执行逻辑推理、合一与 tactic 自动化。"
    }
  },
  "human_contribution": {
    "description": {
      "en": "Lawrence Paulson and collaborators designed the generic architecture, object-logic encodings and automation mechanisms.",
      "zh-CN": "Lawrence Paulson 与合作者设计通用架构、对象逻辑编码与自动化机制。"
    }
  },
  "systems": [
    "isabelle"
  ],
  "organizations": [
    "university-of-cambridge"
  ],
  "people": [
    "lawrence-paulson"
  ],
  "problems": [
    "generic-theorem-proving"
  ],
  "methods": [
    "higher-order-unification",
    "tactics",
    "interactive-theorem-proving"
  ],
  "verification": {
    "evidence_level": "E2",
    "status": "paper_released",
    "formal_assurance": "none",
    "history": [
      {
        "date": "1988-05-23",
        "status": "paper_released",
        "evidence_level": "E2",
        "note": {
          "en": "The CADE-9 proceedings establish the public system description; official Isabelle archives corroborate an earlier Isabelle86 release.",
          "zh-CN": "CADE-9 proceedings 确认了公开系统描述；Isabelle 官方档案同时佐证更早的 Isabelle86 版本。"
        }
      }
    ]
  },
  "sources": [
    {
      "id": "cade9-isabelle-1988",
      "tier": "S1",
      "type": "paper",
      "title": "Isabelle — The Next Seven Hundred Theorem Provers",
      "url": "https://link.springer.com/book/10.1007/BFb0012819",
      "primary": true,
      "published_date": "1988-05-23",
      "accessed_at": "2026-09-15"
    },
    {
      "id": "isabelle-official-release-archive",
      "tier": "S2",
      "type": "official_announcement",
      "title": "Older Isabelle Releases",
      "url": "https://isabelle.in.tum.de/download_past.html",
      "primary": false,
      "published_date": null,
      "accessed_at": "2026-09-15"
    }
  ],
  "artifacts": [],
  "relationships": {
    "predecessors": [
      "evt-1979-edinburgh-lcf"
    ],
    "successors": [],
    "related": [
      "evt-1988-hol"
    ]
  },
  "timeline": {
    "featured": true,
    "significance": "primary"
  },
  "tags": [
    "isabelle",
    "proof-assistant",
    "generic-theorem-prover",
    "formalization"
  ],
  "editorial": {
    "created_at": "2026-09-15",
    "last_reviewed": "2026-09-15",
    "reviewers": [
      "Charlie-Wang-03"
    ]
  },
  "corrections": []
}