{
 "id": "LIB2-245",
 "entry_version": 8,
 "class": "RETIRED",
 "title": "Retired physical use of the PSL class-algebra sign argument",
 "statement": "The earlier class-algebra argument used a vanishing structure constant to select the sign of a leptonic phase formula; the current print types δCP = −2π/√5 = −160.997° Derived-conditional (Rev29 re-tiering; the pre-Rev29 stamp was Theorem ⋆100), from the V3 rotation and not from that argument.",
 "scope": {
  "carrier": null,
  "domain": "The deprecated phase-derivation application, not the retained class-algebra coefficients.",
  "group": null,
  "hypotheses": [],
  "physical_target": null,
  "quantifier": null,
  "real_form": null
 },
 "source_labels_as_printed": {
  "math_status": null,
  "attachment": null,
  "scorecard_tier_word": null,
  "pdf_page": null
 },
 "house_tier": null,
 "review_state": "IN_REVIEW",
 "scientific_status": "RETIRED",
 "evidence_status": [
  {
   "kind": "registry",
   "availability": "shipped"
  }
 ],
 "primary_source": {
  "component": "Paper 8",
  "section": "§2, Retired physical use of the class-algebra constants",
  "pdf_page": 122,
  "quote": "That application is deprecated. The authoritative CP phase is δCP = −2π/ 5 = −160.997◦ from the V3 rotation (Derived-conditional after the Rev29 re-tiering; pre-Rev29 stamp ⋆100; Paper 5, Appendix C), which does not involve PSL(2, 7) at all;"
 },
 "caution": "The pure class-algebra constants survive, and the old phase expression remains only as a labelled cross-check.",
 "candidate_ids": [
  "C2-172"
 ],
 "basis": {
  "pdf_sha256_prefix": "b64ddcd9e16a6dcd",
  "release": "Rev33.1_S369"
 },
 "relationships": [
  {
   "type": "related_to",
   "target": "LIB2-057"
  }
 ],
 "url": "/library-v2/LIB2-245/",
 "content_sha256": "00120f5b500ac07f8e790412999e5274f674825a14429d467cfa8c03b2a9816b",
 "build_stamp": "BUILD_STAMP S371a · 2026-09-26T22:53Z · master 01d1a5873ede42f5 · cut 9dcc6ce9a8ee3e02"
}