law length_cons

bend-mathlib@0.8.1.0 · list.bend:469

import Base

469# A cons is one longer than its tail.
470law length_cons:
471  for -a: Quant
472  for -A: Kind(a)
473  for -x: A
474  for -xs: List<a, A>
475  {List.length(a, A, x <> xs) == 1n+List.length(a, A, xs) : Nat}