law double_sub_sym

bend-mathlib@0.8.1.0 · nat.bend:4828

import Base

4828# Doubling distributes over truncated subtraction: double (a - b) = double a - double b, reversed to rewrite toward the simple side.
4829law double_sub_sym:
4830  for a: Nat
4831  for b: Nat
4832  {Nat.sub(Nat.double(a), Nat.double(b)) == Nat.double(Nat.sub(a, b)) : Nat}