# C794 — Reconstruct the BJ deletion path

## Question

Does deleting the57-year edge preserve the supplied upstream and downstream relations?

## Inputs

```json
{}
```

## Sources

```json
[
  "File53 §3A.1–2"
]
```

## Opened utc

2026-09-28T02:05:40.026931+00:00

## Results

```json
{
  "path": {
    "path": "model/BJ_deletion_path.json",
    "sha256": "e724d12a5afe6f818d3879aa1924d52ca261ca78492ca2b7b2c36da6986058ba",
    "bytes": 267
  },
  "original": [
    3856,
    2549,
    2482,
    2425
  ],
  "secondary_expunged": [
    3799,
    2492,
    2425
  ],
  "original_gaps": [
    1307,
    67,
    57
  ],
  "expunged_gaps": [
    1307,
    67
  ],
  "total_before_after": [
    1431,
    1374
  ]
}
```

## Finding

The secondary contraction removes57 while holding Shelah fixed and shifting both upstream Creation and Flood by57. The1307 Creation–Flood interval is retained as inherited source structure.

## Reassessment

Compare the index and duration weights across BJ, regular, and cumulative Cainan operations.

## Checks

```json
{
  "preserved_1307": true,
  "removed57": true,
  "remaining67": true
}
```

## Closed utc

2026-09-28T02:05:40.028395+00:00

## Record provenance

Exact record hash: `6ec8800b4b37597486141751fd8d1608ff840d7723bf1c2c379c34051f02144c`

Source journal: `Research_Cycles/C0732_C0831/journal.json`