Nat.succ_sub_succ_sym: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/nat.bend as Nat
Lines 4028-4032 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=4028&end_line=4032

import Base

# Subtracting successors: (n + 1) - (m + 1) = n - m, reversed to rewrite toward the simple side.
law succ_sub_succ_sym:
  for -n: Nat
  for -m: Nat
  {Nat.sub(n, m) == Nat.sub(1n+n, 1n+m) : Nat}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub
  https://jend.leeeet.dev/definition.txt?path=bend-mathlib@0.8.1.0/nat.bend&name=succ_sub_succ