law nil_append

bend-mathlib@0.8.1.0 · list.bend:22

import Base

22# The empty list is a left identity for append: [] ++ xs = xs.
23law nil_append:
24  for -a: Quant
25  for -A: Kind(a)
26  for -xs: List<a, A>
27  {List.append(a, A, Nil{}, xs) == xs : List<a, A>}