Mathlib v4.30 source proposition Nat.descFactorial_zero

Identifier: F:ml430-nat-descfactorial-zero-966b01df
Proof route: kernel-lean
External status: proved
Axiom footprint: Empty

Recorded description

The proposition declared as `Nat.descFactorial_zero` in the pinned Mathlib v4.30 source.

Formal statement

∀ (n : ℕ), n.descFactorial 0 = 1

Dependencies

The graph shows direct ledger edges. Follow a node to open its artifact page.

0 direct dependencies 0 direct dependents

Evidence

autogenesis-operation-3675df4623f421cf

Kind: kernel-term
Status: checked

Supports: The proposition declared as `Nat.descFactorial_zero` in the pinned Mathlib v4.30 source.

Checker command

python3 scripts/check-autogenesis-fact-operation.py --fact artifacts/facts/F-ml430-nat-descfactorial-zero-966b01df.json

Evidence notes

Derived from a clean-commit typed execution receipt. The registered fact-operation checker replays the proof-isolated statement artifact through a fresh importer and requires the exact kernel-checked proof and dependency-free result; no caller-authored route, footprint, checker, or shell command is accepted.

Provenance

{
  "date": "2026-08-18",
  "established_by": "axeyum-autogenesis execution 0df6474434389aadbdd542a11d361ff85eb625a416c3c75861ea4c557316a97f",
  "prior_art": [
    {
      "attribution": "the proposition was read from the pinned statement-only inventory; the proof term and tactic trace were not consulted",
      "what": "the theorem declaration `Nat.descFactorial_zero`",
      "where": "mathlib4 commit c5ea00351c28e24afc9f0f84379aa41082b1188f (v4.30.0)",
      "who": "the Mathlib contributors",
      "year": 2026
    }
  ],
  "source": "statement-only extraction of `Nat.descFactorial_zero` from Mathlib v4.30.0; no proof value was exposed"
}