law get_cons_zero_sym

bend-mathlib@0.8.1.0 · list.bend:2913

import Base

2913# The element at index zero of a cons is its head, reversed to rewrite toward the simple side.
2914law get_cons_zero_sym:
2915  for -a: Quant
2916  for -A: Kind(a)
2917  for -x: A
2918  for -xs: List<a, A>
2919  {Some{x} == List.get(a, A, x <> xs, 0n) : Maybe<a, A>}