# LIB2-011 — The cubic Jordan slice is a Lagrangian boundary of the FTS

- 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.348)
- basis: {"pdf_sha256_prefix": "b64ddcd9e16a6dcd", "release": "Rev33.1_S369"}

## Statement

The slice LJ = Re− ⊕ J+2 carrying the golden ladder is a 28-dimensional Lagrangian subspace of the real FTS 56.

## Caution

The symplectic form contributes kinematics, not a mass-sector Hamiltonian or dynamics selector; the conjugate-section attachment remains open.

## Primary source

Appendix X, P0-1 audit, The result: definition of LJ, PDF p.369: "Writing LJ = Re− ⊕ J+2 for the slice carrying the golden ladder:"

## Machine

- url: /library-v2/LIB2-011/
- content_sha256: fda5dab99db77b8484e7c040bff52432dee31af48504a4a40480ec6c22361c13
- candidate_ids: C2-032

## Freshness

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