# C941 — Identify the cumulative carry condition

## Question

Which source feature chooses the convergent branch?

## Inputs

```json
{}
```

## Sources

```json
[
  "C938–940"
]
```

## Opened utc

2026-09-28T03:38:57.864024+00:00

## Results

```json
{
  "source_carry": [
    1,
    0
  ],
  "condition": {
    "path": "model/cumulative_branch_condition.json",
    "sha256": "3f78df424cb42b90e957a9442344a88de8b55ec16066738f53b2274a6e0d4c70",
    "bytes": 308
  }
}
```

## Finding

At fixed total12600 and this register, convergence is equivalent to no tens-to-hundreds carry in the original two-core addition. The source917+343 has tens sum5 and selects that branch. Its exact breakpoint contains more information than the outer equality requires.

## Reassessment

Derive the exact990 displacement from the single carry exchange.

## Checks

```json
{
  "branch": true,
  "carry": true
}
```

## Closed utc

2026-09-28T03:38:57.864383+00:00

## Record provenance

Exact record hash: `0ad08745f84361dcb1ff5acb3f543ac1904d1b618e6158a60658db668ce4a7e2`

Source journal: `Research_Cycles/C0932_C1131/journal.json`