Nat.double_sub: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/nat.bend as Nat
Lines 3595-3599 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=3595&end_line=3599

import Base

# Doubling distributes over truncated subtraction: double (a - b) = double a - double b.
law double_sub:
  for a: Nat
  for b: Nat
  {Nat.double(Nat.sub(a, b)) == Nat.sub(Nat.double(a), Nat.double(b)) : Nat}

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.double
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub