def bitw.below
import bend-osdev-algo@0.1.0.0/PROOF.bend as PROOFimport Base
201# j lies below the lowest set bit (every j does when there is none)
202def bitw.below(j: Nat, m: Nat) -> Bool:
203 match m:
204 case 0n:
205 True{}
206 case 1n+k:
207 Nat.is_lt(j, k)