Mathlib v4.30 source proposition Nat.dist_add_add_left

Identifier: F:ml430-nat-dist-add-add-left-92fa4403
Proof route: kernel-lean
External status: proved
Axiom footprint: Empty

Recorded description

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

Formal statement

∀ (k n m : ℕ), (k + n).dist (k + m) = n.dist m

Dependencies

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0 direct dependencies 1 direct dependents

Evidence

kernel-Nat.dist_add_add_left

Kind: kernel-term
Status: checked

Supports: ∀ (k n m : ℕ), (k + n).dist (k + m) = n.dist m

Checker command

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

Evidence notes

`build_nat_prelude` admits `Nat.dist_add_add_left` through the trusted `Kernel::add_declaration` gate (`nat_prelude/dist.rs`, `declare_dist_more_all`, lane draw9-first-theorems). `nat_theorem_inventory`'s rendered type matches this fact's `formal.statement`. Anchored with `^Nat\.dist_add_add_left[[:space:]]` so a sibling name cannot satisfy this row; `grep -Ec` consumes the pipe so the tested count decides the exit status. Run `--release` -- the debug build of this inventory example SIGABRTs on stack depth (unrelated to this proof).

compute-Nat.dist_add_add_left

Kind: kernel-term
Status: checked

Supports: dist_add_add_left at (k,n,m) = (4,9,2): dist(13,6) = 7 = dist(9,2).

Checker command

cargo test -p axeyum-lean-kernel --lib nat_prelude::nat_prelude_tests::dist_draw9_additions_apply_at_concrete_discriminating_instances

footprint-Nat.dist_add_add_left

Kind: exhaustive-enumeration
Status: checked

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

Checker command

cargo run -q --release -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 (measured: axiom=0 opaque=0 quotient=0).

Provenance

{
  "date": "2026-08-30",
  "established_by": "lane draw9-first-theorems",
  "source": "statement-only extraction of `Nat.dist_add_add_left` from Mathlib v4.30.0; no proof value was exposed",
  "prior_art": [
    {
      "who": "the Mathlib contributors",
      "what": "the theorem declaration `Nat.dist_add_add_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"
    }
  ]
}