# C767 — Recover rounded bridge changes locally

## Question

Do changes in adjacent bridge gaps equal row rounding differences?

## Inputs

```json
{}
```

## Sources

```json
[
  "C766; File51a strict comparison"
]
```

## Opened utc

2026-09-28T01:57:56.320400+00:00

## Results

```json
{
  "local_changes": [
    {
      "name": "Adam",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Seth",
      "field_difference": -2,
      "row_prediction": -2
    },
    {
      "name": "Enosh",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Kenan",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Mahalalel",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Jared",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Enoch",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Methuselah",
      "field_difference": 3,
      "row_prediction": 3
    },
    {
      "name": "Lamech",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Noah",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Shem",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Arphaxad",
      "field_difference": 2,
      "row_prediction": 2
    },
    {
      "name": "Shelah",
      "field_difference": 2,
      "row_prediction": 2
    },
    {
      "name": "Eber",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Peleg",
      "field_difference": 1,
      "row_prediction": 1
    },
    {
      "name": "Reu",
      "field_difference": 3,
      "row_prediction": 3
    },
    {
      "name": "Serug",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Nahor",
      "field_difference": 1,
      "row_prediction": 1
    },
    {
      "name": "Terah",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Abraham",
      "field_difference": 0,
      "row_prediction": 0
    },
    {
      "name": "Isaac",
      "field_difference": 0,
      "row_prediction": 0
    }
  ],
  "scope": "21 consecutive strict regular edges Adam→Jacob; Jacob/Joseph collateral is not continued to Levi"
}
```

## Finding

The rounded bridge itself is generated locally by e(L)−e(b). This joins source rows, mode choice, and rounding in one recurrence.

## Reassessment

Test direct rounding of date labels against the source-derived field.

## Checks

```json
{
  "all_edges": true,
  "count": true
}
```

## Closed utc

2026-09-28T01:57:56.321299+00:00

## Record provenance

Exact record hash: `60758d6eaf739575a49a25c177ecbcce4013e6784dc06d70ac8f4dcb7c158087`

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