List.zip_nil_left_sym: law of bend-mathlib@0.8.1.0
Import: import bend-mathlib@0.8.1.0/list.bend as List
Lines 2845-2852 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=2845&end_line=2852

import Base

# Zipping the empty list with anything gives the empty list, reversed to rewrite toward the simple side.
law zip_nil_left_sym:
  for -a: Quant
  for -A: Kind(a)
  for -b: Quant
  for -B: Kind(b)
  for -ys: List<b, B>
  {Nil{} == List.zip(a, A, b, B, Nil{}, ys) : List<&1, A & B>}

Uses (5):
  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.zip
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=bend-mathlib@0.8.1.0/list.bend&name=zip_nil_left