# C909 — Justify the retained information by complete-object witnesses

## Question

Why does each additional source register belong in the model?

## Inputs

```json
{}
```

## Sources

```json
[
  "C836,840,844–848,857,861,879,882,894,898"
]
```

## Opened utc

2026-09-28T02:56:37.536069+00:00

## Results

```json
{
  "necessity_evidence": {
    "path": "model/finite_register_necessity.json",
    "sha256": "20d499d369f930b8c000392f332ef9d557d78b415487f95aa813cfb7cb8c4026",
    "bytes": 1092
  }
}
```

## Finding

Each retained information type has a concrete witness showing what its removal loses. This supports a compact grammar over the tested families; it does not prove a unique or globally minimal model.

## Reassessment

State the unified source-object schema and the distinct operations it admits.

## Checks

```json
{
  "seven_witnesses": true,
  "no_duplicate_register": true
}
```

## Closed utc

2026-09-28T02:56:37.536456+00:00

## Record provenance

Exact record hash: `d56d5d29769212c95d586c5df4ba2d7d61785ca7de2e2ede0fa7682e6d8e4163`

Source journal: `Research_Cycles/C0832_C0931/journal.json`