law length_cons_sym

bend-mathlib@0.8.1.0 · list.bend:2447

import Base

2447# A cons is one longer than its tail, reversed to rewrite toward the simple side.
2448law length_cons_sym:
2449  for -a: Quant
2450  for -A: Kind(a)
2451  for -x: A
2452  for -xs: List<a, A>
2453  {1n+List.length(a, A, xs) == List.length(a, A, x <> xs) : Nat}