C191 — The Isaac-death complement window realizes 460→500 around 4K
23 September 2026 · Step 36 of 50, continuing C155.
The existing Isaac-death/complement window1886→2346 has width460; dilation25/23 about4K sends it to1866→2366, width500. Its center remains2116 and its two images remain complementary.
The initial1886 endpoint is the reflected MT Isaac-death source;2346 is its generated8K complement. Both expanded endpoints are generated. This realizes the familiar460→500 length relation inside the529-centered geometry without identifying the expanded points as new Isaac events.
The same centered map was checked against the retained Moses, Exodus, Conquest, Isaac-birth, Abram and Peleg anchors. Most images are fractional annual centers because their distances from2116 are not divisible by23. The exact symmetry therefore survives more broadly than annual source-endpoint admission.
This is a local geometric comparison. It does not alter Isaac's180-year lifespan or supply a historical dilation of his whole biography.
Evidence and scope
K=529. Positive BC base B denotes (B+1)t/Bn BC; reflected AD base A denotes AD At/(A+1)n. Their same-season civil span is B+A, after the no-year-zero correction. AD source projections are not historical AD occurrences. Generated coordinates and interval midpoints do not acquire event identity from numerical coincidence.
Regular Gears remain confined to Noah/Shem/Flood. Creation and Conquest use fixed source-field members; no fourth Gear is admitted. File_18/File_09 and the C127 graph are unchanged. C133–C155 source corrections remain controlling, with the C10 ancestry of the next-Flood-Gear rule now explicit. No historical campaign is rerun, no quarantined primer is reopened, and no N01/N03 expansion or missing Shem join is repaired. Original Reports 01–10 remain previously verified; interrupted original Reports 11–25 remain unestablished.
Sources: controlling File_18 §§2–3, 6A–6D; File_09 paired Mirror rules; selectively retained C05, C08, C10, C123, C128 and C133–C155 evidence. Specific dependencies are named in the body/certificate. 28 assertions passed; see RESULTS.json and CERTIFICATE.json. Assertions, selected field combinations and inherited identities are not independent historical witness counts.