{
  "capability_id": "engineering.uncertainty.welch_satterthwaite",
  "calculation_version": "1.0.1",
  "protocol_version": "1.0.0-proposed",
  "protocol_document_status": "proposed",
  "verification_revision": "2026-09-23.o2-o3",
  "claim_scope": "O2: JCGM 100 G.4 ν_eff = u_c⁴ / Σ(u_i⁴/ν_i) vs separate-module identities (≤2 ULP). Not GUM propagate and not U=k·u_c. ≤2 ULP vs O3 applies only to the published tabulated G.4 vectors (equal Type A, one infinite Type B, supplied u_c, all-infinite, aliases, three components, scale, a zero component). It is not a whole-domain guarantee and does not cover GUM propagate or U=k·u_c.",
  "oracle": {
    "class": "O3",
    "library": "mpmath 1.4.1",
    "mpmath_dps": 80,
    "backend": null,
    "rounding": null,
    "independent_of_iut": true,
    "generator_id": "welch-satterthwaite-mpmath-o3",
    "generator_version": "1.0.0",
    "generator_sha256": "a9b25c3b16aba9258c3de32869e54989e9bcc83fd42753d7584a4d5ae007b57b",
    "table_sha256": "c878bf365689dfc896c1331fd97cd4862bd7f7a91b11ae5d2c9d3f938b6818cb"
  },
  "result_summary": {
    "passed": 8,
    "total": 8,
    "failed": 0,
    "max_error_ulp": 1,
    "threshold_ulp": 2,
    "max_threshold_ulp": 2
  },
  "public_files": {
    "manifest": "/evidence/engineering.uncertainty.welch_satterthwaite/1.0.1.cvp.json",
    "this_file": "/evidence/engineering.uncertainty.welch_satterthwaite/reproduce.json"
  },
  "vectors": [],
  "disclosure": {
    "policy": "calculatorx-public-evidence-v1",
    "full_validation": "private",
    "representation": "summary",
    "kind": "reproduce"
  }
}