law nat_add_four

bend-mathlib@0.8.1.0 · algebra.bend:141

import Base
import bend-mathlib@0.8.1.0/nat.bend as MNat

141# Nat addition's middle-four interchange (the same statement as MNat.add_add_add_comm).
142law nat_add_four:
143  for +a: Nat
144  for +b: Nat
145  for +c: Nat
146  for +d: Nat
147  {Nat.add(Nat.add(a, b), Nat.add(c, d)) == Nat.add(Nat.add(a, c), Nat.add(b, d)) : Nat}