# LIB2-253 — Retired structural derivation rating of the CKM phase construction

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

## Statement

The earlier CKM phase account gave its readout-conditioned construction a structural derivation rating despite the missing selection of its correction term.

## Caution

The re-tiering does not delete the numeral, supply a correction-term selector or merge the global-fit phase with the direct UT angle.

## Primary source

Appendix B, §B.6, Current phase provenance and retired wording, PDF p.160: "The Dirac phase δCKM is not of that grade: it is a candidate construction under a named readout axiom (stated immediately below), i.e. a Coincidence-class numeral with an algebraic identity behind it and no selection of G7 (Rev32.5 retype; the Rev29 “Structural claim with a derivation path” wording is retired)."

## Machine

- url: /library-v2/LIB2-253/
- content_sha256: c4fd2929723b2a62decbf6d2686b7aaca8b2e0558f0db59ccba6952d70d6e6ca
- candidate_ids: C2-012 C2-065

## Freshness

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