Mathlib v4.30 source proposition Nat.coprime_add_self_left

Identifier: F:ml430-nat-coprime-add-self-left-5e93448c
Proof route: kernel-lean
External status: proved
Axiom footprint: Empty

Recorded description

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

Formal statement

∀ {m n : ℕ}, (m + n).Coprime n ↔ m.Coprime n

Dependencies

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2 direct dependencies 1 direct dependents

Evidence

kernel-Nat.coprime_add_self_left

Kind: kernel-term
Status: checked

Supports: (m + n).Coprime n iff m.Coprime n

Checker command

test "$(cargo run -q -p axeyum-lean-kernel --example nat_theorem_inventory -- coprime_add_self_left 2>/dev/null | grep -Ec '^Nat\.coprime_add_self_left[[:space:]]')" -ge 1

Evidence notes

`build_nat_prelude` admits this theorem through the trusted `Kernel::add_declaration` gate, which re-checks the constructed proof term against the stated type: `gcd (m+n) n = 1` transports to `gcd n (m+n) = 1` via `coprime_symmetric`, which the already-proved `coprime_add_self_right` instantiated at `(n, m)` relates to `gcd n m = 1`, which transports back via `coprime_symmetric` to `gcd m n = 1` -- and the whole chain runs in both directions, giving the `Iff`. `nat_theorem_inventory` exits non-zero for a name that does not exist, and the `grep -c` requires the admitted declaration to be printed.

footprint-Nat.coprime_add_self_left

Kind: exhaustive-enumeration
Status: checked

Supports: axiom_footprint: [] -- the Nat prelude's trusted surface is empty

Checker command

cargo run -q -p axeyum-lean-kernel --example nat_axiom_inventory -- --require-axiom-free nat

Evidence notes

`nat_axiom_inventory --require-axiom-free nat` enumerates the built Nat environment and exits non-zero unless it admits no Axiom, Opaque or Quotient declaration. A theorem cannot depend on a trusted declaration the environment does not contain, so an empty trusted surface bounds every individual theorem's footprint by [].

Provenance

{
  "date": "2026-08-28",
  "established_by": "axeyum-lean-kernel build_nat_prelude, lane nat-gcd",
  "source": "statement-only extraction of the Mathlib proposition from Mathlib v4.30.0 (see prior_art), independently proved here as `Nat.coprime_add_self_left` and admitted through `Kernel::add_declaration`",
  "prior_art": [
    {
      "who": "the Mathlib contributors",
      "what": "the theorem declaration `Nat.coprime_add_self_left`",
      "where": "mathlib4 commit c5ea00351c28e24afc9f0f84379aa41082b1188f (v4.30.0)",
      "year": 2026,
      "attribution": "the proposition was read from the pinned statement-only inventory; the proof term and tactic trace were not consulted"
    }
  ]
}