Mathlib v4.30 source proposition Nat.clog_zero_right

Identifier: F:ml430-nat-clog-zero-right-d42d47b1
Proof route: kernel-lean
External status: proved
Axiom footprint: Empty

Recorded description

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

Formal statement

∀ (b : ℕ), Nat.clog b 0 = 0

Dependencies

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

0 direct dependencies 1 direct dependents

Evidence

kernel-Nat.clog_zero_right

Kind: kernel-term
Status: checked

Supports: `Nat.clog_zero_right` is admitted as a Theorem with EXACTLY the stated shape, pinned verbatim via the kernel's own renderer: `((x0 : AxNat) -> Eq.{1} AxNat (AxNat.clog x0 AxNat.zero) AxNat.zero)`.

Checker command

test "$(cargo run -q --release -p axeyum-lean-kernel --example nat_theorem_inventory 2>/dev/null | awk -F'\t' '$1 == "Nat.clog_zero_right" && $3 == "((x0 : AxNat) -> Eq.{1} AxNat (AxNat.clog x0 AxNat.zero) AxNat.zero)"' | wc -l)" -ge 1

footprint-Nat.clog_zero_right

Kind: exhaustive-enumeration
Status: checked

Supports: axiom_footprint: [] for `Nat.clog_zero_right`. The `nat` prelude's trusted surface is empty (no Axiom, no Opaque, no Quotient), which bounds every declaration in it, including `Nat.clog_zero_right`.

Checker command

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

Provenance

{
  "date": "2026-08-18",
  "established_by": "kernel prelude build (crates/axeyum-lean-kernel/src/), predating this mirror's preregistration; found and verified by lane already-proved-sweep (2026-08-29), not proved by this lane",
  "source": "statement-only extraction of `Nat.clog_zero_right` from Mathlib v4.30.0; no proof value was exposed",
  "prior_art": [
    {
      "who": "the Mathlib contributors",
      "what": "the theorem declaration `Nat.clog_zero_right`",
      "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"
    }
  ]
}