{"id": "c1142", "title": "C1142 — Explain the Methuselah249 reduction by local changes", "filename": "C1142.md", "role": "Research action", "step": 1142, "sha256": "b6e7a89ec265eb1e705e1ec3a2d2042b409577a8d002806f0dd318b8f94f5ca5", "bytes": 1180, "origins": ["C480–C1634/Research_Cycles/C1132_C1431_Recovered/journal.json#C1142"], "download": "/sources/b6e7a89ec265eb1e705e1ec3a2d2042b409577a8d002806f0dd318b8f94f5ca5.md", "format": "md", "derived": true, "tags": [], "excerpt": "Which pieces of the retained source shift produce249 rather than250?", "content": "# C1142 — Explain the Methuselah249 reduction by local changes\n\n## Question\n\nWhich pieces of the retained source shift produce249 rather than250?\n\n## Inputs\n\n```json\n{}\n```\n\n## Sources\n\n```json\n[\n  \"C1141\",\n  \"File18 §§2.1.3,3.1\"\n]\n```\n\n## Opened utc\n\n2026-09-28T05:01:15.642695+00:00\n\n## Results\n\n```json\n{\n  \"local_reduction\": {\n    \"path\": \"model/Methuselah_reduction_decomposition.json\",\n    \"sha256\": \"9613acc437399d19ecf7d394e9e7031aab6d0633eac1ad3bb00846c643bcb5fc\",\n    \"bytes\": 299\n  },\n  \"reduction\": 249\n}\n```\n\n## Finding\n\nThe249 reduction is120+130−1: two local age changes and one count-convention difference. Using the ordinal53 label gives129 at that stage, but the completed52 primary path must not receive a second correction.\n\n## Reassessment\n\nPlace all nine ancestral rows on the same capacity-and-slack comparison.\n\n## Checks\n\n```json\n{\n  \"exact_reduction\": true,\n  \"same_primary_count\": true,\n  \"ordinal_identity\": true\n}\n```\n\n## Closed utc\n\n2026-09-28T05:01:15.642998+00:00\n\n## Record provenance\n\nExact record hash: `e9b892f41e1032aae886ae8f4f531d760f84364db14ed4785ea813d2e7d627fc`\n\nSource journal: `Research_Cycles/C1132_C1431_Recovered/journal.json`", "journalDownload": "/sources/6adb632ce171623c2bce60d7ed58ae319ccb379cf76b751c0a477c1742fd348c.json", "evidenceLinks": [{"id": "d-9613acc437399d19", "title": "model/Methuselah_reduction_decomposition.json"}, {"id": "d-68301ab760bfbe2e", "title": "File 18"}]}