def half_dbl0
import bend-collections-laws-math@1.0.0.0/proofs/math/random/lemire.bend as Lemireimport Base
import bend-collections-laws-math@1.0.0.0/spec/lib/common.bend as C
import bend-collections-laws-math@1.0.0.0/proofs/math/typed/width.bend as WI
403def half_dbl0(+y: Nat) -> {C.half(Nat.double(y)) == y : Nat}:
404 WI.half_dbl(0n, y)