{"id": "c659", "title": "C659 — Generate the cumulative1400 rectangle", "filename": "C659.md", "role": "Research action", "step": 659, "sha256": "18dd582f84bcc0ca661da1a6cde94ef9a165f3b55b6a529b294265f14d9ceb6e", "bytes": 1169, "origins": ["C480–C1634/Research_Cycles/C0632_C0731/journal.json#C659"], "download": "/sources/18dd582f84bcc0ca661da1a6cde94ef9a165f3b55b6a529b294265f14d9ceb6e.md", "format": "md", "derived": true, "tags": ["Cumulative"], "excerpt": "Are the four source spans independent or generated by matching70-year rails?", "content": "# C659 — Generate the cumulative1400 rectangle\n\n## Question\n\nAre the four source spans independent or generated by matching70-year rails?\n\n## Inputs\n\n```json\n{\n  \"upper\": [\n    2006,\n    1936\n  ],\n  \"lower\": [\n    606,\n    536\n  ]\n}\n```\n\n## Sources\n\n```json\n[\n  \"File70 A.13.4 CM028–030; C658\"\n]\n```\n\n## Opened utc\n\n2026-09-28T01:07:20.033807+00:00\n\n## Results\n\n```json\n{\n  \"matrix\": [\n    [\n      1400,\n      1470\n    ],\n    [\n      1330,\n      1400\n    ]\n  ],\n  \"formula\": \"1400+70(j−i)\",\n  \"rail_indices\": [\n    [\n      49,\n      50\n    ],\n    [\n      69,\n      70\n    ]\n  ]\n}\n```\n\n## Finding\n\nThe1400 rectangle is the existing rail generator at spacing70. Its crossed1330/1470 spans follow from matching rails; the second1400 is a dependent corresponding comparison.\n\n## Reassessment\n\nRecover the source’s490|910 lower subdivision and locate Exodus within the same index.\n\n## Checks\n\n```json\n{\n  \"matrix\": true,\n  \"translation\": true\n}\n```\n\n## Closed utc\n\n2026-09-28T01:07:20.034008+00:00\n\n## Record provenance\n\nExact record hash: `ab2f1743e5cdeb2823d0646105d6079a963e48e58ec52d3aeffc29f5e803cd1e`\n\nSource journal: `Research_Cycles/C0632_C0731/journal.json`", "journalDownload": "/sources/f0643e934c6a7443706351fa40040684d915ed0ae25c0f9188a4c4dba12814ff.json", "evidenceLinks": [{"id": "d-0fa80217c94b3951", "title": "File 70"}]}