Nat.add_assoc: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/nat.bend as Nat
Lines 71-76 of bend-mathlib@0.8.1.0/nat.bend: https://jend.leeeet.dev/read.txt?path=bend-mathlib@0.8.1.0/nat.bend&start_line=71&end_line=76

import Base

# Addition is associative: (a + b) + c = a + (b + c).
law add_assoc:
  for a: Nat
  for -b: Nat
  for -c: Nat
  {Nat.add(Nat.add(a, b), c) == Nat.add(a, Nat.add(b, c)) : Nat}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add