# LIB2-071 — CKM unitarity holds by construction in the chosen parametrisation

- 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.48)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The CKM assembly satisfies all six unitarity relations identically because it uses the standard unitary parametrisation.

## Caution

Unitarity by construction is not an independent success and does not resolve the source’s CKM-angle inconsistency.

## Primary source

Paper 3, §2.1, Unitarity of the standard parametrisation, PDF p.50: "Because the matrix is built from the standard unitary parameterisation, all six unitarity relations hold identically."

## Machine

- url: /library-v2/LIB2-071/
- content_sha256: 666c94befec1d6b4da6a5980e87c9ff064bffa56e18c6012c7b87d018d167687
- candidate_ids: C2-066

## Freshness

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