Sim.back_step: law of bend-lawful-stdlib@0.1.0.0
Import: import bend-lawful-stdlib@0.1.0.0/src/sim.bend as Sim
Lines 33-39 of bend-lawful-stdlib@0.1.0.0/src/sim.bend: https://jend.leeeet.dev/read.txt?path=bend-lawful-stdlib@0.1.0.0/src/sim.bend&start_line=33&end_line=39

import Base
import bend-lawful-stdlib@0.1.0.0/src/class.bend as C

# back undoes step
law back_step:
  for ~P: Data
  for ~g: C.Group<P>
  for ~F: P -> P
  for s: State<P>
  {s == back(~P, ~g, ~F, step(~P, ~g, ~F, s)) : State<P>}

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=bend-lawful-stdlib@0.1.0.0/src/class.bend&name=Group
  https://jend.leeeet.dev/definition.txt?path=bend-lawful-stdlib@0.1.0.0/src/class.bend&name=Group.add
  https://jend.leeeet.dev/definition.txt?path=bend-lawful-stdlib@0.1.0.0/src/class.bend&name=Group.sub
  https://jend.leeeet.dev/definition.txt?path=bend-lawful-stdlib@0.1.0.0/src/class.bend&name=Group.sub_add
  https://jend.leeeet.dev/definition.txt?path=bend-lawful-stdlib@0.1.0.0/src/sim.bend&name=State
  https://jend.leeeet.dev/definition.txt?path=bend-lawful-stdlib@0.1.0.0/src/sim.bend&name=back
  https://jend.leeeet.dev/definition.txt?path=bend-lawful-stdlib@0.1.0.0/src/sim.bend&name=step