law add_sub_add_right_sym

bend-mathlib@0.8.1.0 · nat.bend:4531

import Base

4531# A common right summand cancels in a difference: (n + k) - (m + k) = n - m, reversed to rewrite toward the simple side.
4532law add_sub_add_right_sym:
4533  for n: Nat
4534  for k: Nat
4535  for m: Nat
4536  {Nat.sub(n, m) == Nat.sub(Nat.add(n, k), Nat.add(m, k)) : Nat}