# LIB2-045 — The braid/trace grammar cannot select the boundary source datum

- class: CLAIM · review_state: PUBLISHED · house_tier: not yet assigned
- labels as printed: math_status NOT_PRINTED · attachment NOT_PRINTED · scorecard tier word none (PDF p.169)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

No construction internal to the registered braid/trace grammar selects the boundary source ray [j] or its equivalent descriptions L∂ and E*, because the source-ray symmetry remains transitive.

## Caution

The grammar can select the separate dark ray; this obstruction concerns the loaded boundary datum and does not exclude external selection laws.

## Primary source

Appendix E, §7, Boundary-source obstruction, PDF p.175: "no construction internal to the braid/trace grammar can select [j], L∂ , or E ∗ . The boundary price is irreducible within the grammar. Scope: genuinely external categories are not excluded."

## Machine

- url: /library-v2/LIB2-045/
- content_sha256: 90ee0598f5fe570a5967e2bd28658a75f97fc87f6d956f589e2b540fecfbd560
- candidate_ids: C2-105

## Freshness

- BUILD_STAMP S371a · 2026-09-26T22:53Z · master 01d1a5873ede42f5 · cut 9dcc6ce9a8ee3e02
- Declared volatile fields (R36): BUILD_STAMP