# C571 — Distinguish endpoint agreement from path identity

## Question

Do whole J and terminal-cell E have the same intermediate coordinate?

## Inputs

```json
{
  "head": 14004,
  "junction": 1929,
  "terminal": 1446
}
```

## Sources

```json
[
  "File63 §§7.3–7.4,9.7; C570"
]
```

## Opened utc

2026-09-28T00:16:54.013518+00:00

## Results

```json
{
  "whole_J_path": [
    14004,
    "24552/13",
    1404
  ],
  "terminal_E_path": [
    14004,
    1929,
    1404
  ],
  "junction_difference": "525/13"
}
```

## Finding

Both paths end at1404, but whole J moves the junction to24552/13 while terminal E retains1929. The new compression is equality after evaluating total span, not identity of the ordered chronological path.

## Reassessment

Use the shared endpoint1404 to reconstruct the Actual-to-Rounded cumulative interface.

## Checks

```json
{
  "same_endpoint": true,
  "different_junction": true,
  "exact_difference": true
}
```

## Closed utc

2026-09-28T00:16:54.013757+00:00

## Record provenance

Exact record hash: `948b5c185936f61251ff32ae2ee75f64584d4fc322231530d2530f057a788ec6`

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