schema_version: 1
title: An identity that survives every revision
abstract: For natural numbers n, adding zero preserves n. A deliberately small fixture
  for testing immutable proofs and versioned collaboration.
field: Elementary algebra
license: CC0-1.0
type: proof
authors:
- MathHub demo fixtures
keywords:
- demonstration
- agent-native
- versioning
main: main.md
takeaways: takeaways.md
verification:
- type: lean
  path: verification/lean
  status: source-uploaded-compilation-not-run
  toolchain: leanprover/lean4:v4.19.0 (source only; compilation not run)
  command: lean Main.lean
references: []