List.contains_reverse_sym: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/list.bend as List
Lines 2834-2840 of bend-mathlib@0.8.1.0/list.bend: https://jend.leeeet.dev/read.txt?path=bend-mathlib@0.8.1.0/list.bend&start_line=2834&end_line=2840

import Base

# Reversing does not change whether a list contains x, reversed to rewrite toward the simple side.
law contains_reverse_sym:
  for ~A: Data
  for ~eq: A -> A -> Bool
  for xs: List<&2, A>
  for +x: A
  {List.contains(~A, ~eq, xs, x) == List.contains(~A, ~eq, List.reverse(&2, A, xs), x) : Bool}

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.contains
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.reverse
  https://jend.leeeet.dev/definition.txt?path=bend-mathlib@0.8.1.0/list.bend&name=contains_reverse