# C600 — Derive the weekly overlap correction

## Question

Does the excess660 arise from six repeated overlaps?

## Inputs

```json
{
  "weeks": 7,
  "rail": 110,
  "carriers": [
    70,
    72
  ]
}
```

## Sources

```json
[
  "File68 §§8.8–8.10"
]
```

## Opened utc

2026-09-28T00:24:49.843838+00:00

## Results

```json
{
  "interval_accounts": [
    {
      "g": 70,
      "sum": 4200,
      "union": 3540,
      "overlaps": [
        110,
        110,
        110,
        110,
        110,
        110
      ]
    },
    {
      "g": 72,
      "sum": 4298,
      "union": 3638,
      "overlaps": [
        110,
        110,
        110,
        110,
        110,
        110
      ]
    }
  ]
}
```

## Finding

Seven weekly diagonals overlap their neighbours by110 six times. Their summed length exceeds the continuous field union by660. This accounts for the resolution difference without treating summed intervals as one chronological distance.

## Reassessment

Reconstruct every full-resolution weekly boundary and its companion convergence.

## Checks

```json
{
  "overlaps": true,
  "union_identity": true
}
```

## Closed utc

2026-09-28T00:24:49.844082+00:00

## Record provenance

Exact record hash: `085602267ad7de05bbfcdbefe99278778305f46be906b7d93acec1a9566176f3`

Source journal: `Research_Cycles/C0532_C0631/journal.json`