Mathlib v4.30 source proposition Nat.fib_pos

Identifier: F:ml430-nat-fib-pos-9e67bd8e
Proof route: kernel-lean
External status: proved
Axiom footprint: Empty

Recorded description

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

Formal statement

∀ {n : ℕ}, 0 < Nat.fib n ↔ 0 < n

Dependencies

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0 direct dependencies 0 direct dependents

Evidence

autogenesis-operation-d81afedfa5f7bb88

Kind: kernel-term
Status: checked

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

Checker command

python3 scripts/check-autogenesis-fact-operation.py --fact artifacts/facts/F-ml430-nat-fib-pos-9e67bd8e.json

Evidence notes

Derived from a clean-commit typed execution receipt. The registered fact-operation checker replays the immutable capsule and committed identity manifest and requires its exact theorem identity, two fresh imports, empty axiom footprint, and five named direct theorem dependencies; no caller-authored route, footprint, checker, or shell command is accepted.

Provenance

{
  "date": "2026-08-18",
  "established_by": "axeyum-autogenesis execution 70b8abf66ebc47188f8f73903a61df6577cd0fcfbb987f128a6f73943e19ebd3",
  "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.fib_pos`",
      "where": "mathlib4 commit c5ea00351c28e24afc9f0f84379aa41082b1188f (v4.30.0)",
      "who": "the Mathlib contributors",
      "year": 2026
    }
  ],
  "source": "statement-only extraction of `Nat.fib_pos` from Mathlib v4.30.0; no proof value was exposed"
}