Mathlib v4.30 source proposition Int.add_comm

Identifier: F:ml430-int-add-comm-c5722728
Proof route: kernel-lean
External status: proved
Axiom footprint: Empty

Recorded description

The proposition declared as `Int.add_comm` in the pinned Mathlib v4.30 source.

Formal statement

∀ (a b : ℤ), a + b = b + a

Dependencies

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2 direct dependencies 1 direct dependents

Evidence

kernel-Int.add_comm

Kind: kernel-term
Status: checked

Supports: `Int.add_comm` is admitted as a Theorem with EXACTLY the stated shape, pinned verbatim via the kernel's own renderer: `((x0 : Int) -> ((x1 : Int) -> Eq.{1} Int (Int.add x0 x1) (Int.add x1 x0)))`.

Checker command

test "$(cargo run -q --release -p axeyum-lean-kernel --example int_theorem_inventory 2>/dev/null | awk -F'\t' '$1 == "theorem" && $2 == "Int.add_comm" && $4 == "((x0 : Int) -> ((x1 : Int) -> Eq.{1} Int (Int.add x0 x1) (Int.add x1 x0)))"' | wc -l)" -ge 1

footprint-Int.add_comm

Kind: kernel-term
Status: checked

Supports: axiom_footprint: [] for `Int.add_comm`. The `integer` prelude's trusted surface stays 0: no Axiom, no Opaque, no Quotient.

Checker command

cargo run -q --release -p axeyum-lean-kernel --example nat_axiom_inventory -- --include-constructed --require-axiom-free integer

coverage-Int.add_comm

Kind: kernel-term
Status: checked

Supports: Coverage for `Int.add_comm` derived from `kernel.environment()` directly, not from an inventory list -- an Int-namespace declaration missing from `derived_laws` fails this test by name.

Checker command

test "$(cargo test -p axeyum-lean-kernel --lib int_prelude::int_prelude_tests::every_int_declaration_is_checked_and_axiom_free -- --exact 2>&1 | grep -Ec 'test result: ok\. 1 passed; 0 failed')" -ge 1

Provenance

{
  "date": "2026-08-29",
  "established_by": "lane int-add-basics (2026-08-29): found already derived in algebra.rs from an earlier lane's work -- no new kernel declaration needed for this fact. Evidence attached and status flipped by this lane.",
  "source": "statement-only extraction of `Int.add_comm` from Mathlib v4.30.0; no proof value was exposed",
  "prior_art": [
    {
      "who": "the Mathlib contributors",
      "what": "the theorem declaration `Int.add_comm`",
      "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"
    }
  ]
}