Nat.add_left_cancel: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/nat.bend as Nat
Lines 176-182 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=176&end_line=182

import Base

# Addition cancels on the left: a + b = a + c implies b = c.
law add_left_cancel:
  for a: Nat
  for -b: Nat
  for -c: Nat
  for e: {Nat.add(a, b) == Nat.add(a, c) : Nat}
  {b == c : 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.add
  https://jend.leeeet.dev/definition.txt?path=bend-mathlib@0.8.1.0/nat.bend&name=succ_inj