# C793 — Separate index contraction from chronological duration

## Question

What does deleting one Kainan position do to every surviving name?

## Inputs

```json
{}
```

## Sources

```json
[
  "File53 §3; C792"
]
```

## Opened utc

2026-09-28T02:05:25.756513+00:00

## Results

```json
{
  "mapping": {
    "path": "model/BJ_index_contraction.json",
    "sha256": "3586a93662d85e3c4267d584fbc37aeacc78c4507e9c80961af1fbc1e73cc62f",
    "bytes": 2249
  },
  "retained_Kainan_index": 13,
  "retained_Jacob_index": 23,
  "unchanged_prefix": [
    "Adam",
    "Seth",
    "Enosh",
    "Kenan",
    "Mahalalel",
    "Jared",
    "Enoch",
    "Methuselah",
    "Lamech",
    "Noah",
    "Shem",
    "Arpachshad"
  ],
  "shifted_suffix": [
    "Shelah",
    "Eber",
    "Peleg",
    "Reu",
    "Serug",
    "Nahor",
    "Terah",
    "Abraham",
    "Isaac",
    "Jacob / Israel"
  ]
}
```

## Finding

One deletion changes ten surviving indices by one and leaves the twelve-name prefix fixed. Index change alone does not determine a chronological duration.

## Reassessment

Reconstruct the complete57-year deletion ledger.

## Checks

```json
{
  "all_order": true,
  "ten_shifted": true
}
```

## Closed utc

2026-09-28T02:05:25.757024+00:00

## Record provenance

Exact record hash: `923477b9fe1adc919b42af999135f08d67e328e08704852deadf57517fd4ad57`

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