# LIB2-127 — The electron value is the light Koide root under an external empirical rule

- 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.34)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

With the measured tau anchor and QED-matched muon mass, the external empirical Koide rule K = 2/3 gives the selected light root me = 0.5076 MeV.

## Caution

This empirical-rule closure does not derive the electron mass from the bare Jordan algebra or remove the muon-chain loading.

## Primary source

Paper 2, §3.2, External Koide premise, PDF p.36: "The electron mass is determined by the external empirical relation K = 2/3 acting on that mµ chain and the measured mτ anchor [A636, A637]."

## Machine

- url: /library-v2/LIB2-127/
- content_sha256: 43276a80bd768e5ab0aab62b0890aca960cb7b0d8313f81ea25fd509b9a41d96
- candidate_ids: C2-020 C2-057

## Freshness

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