PROOF.lt_m: def of bend-kit-collections@0.1.4.1
Import: import bend-kit-collections@0.1.4.1/PROOF.bend as PROOF
Lines 148-154 of bend-kit-collections@0.1.4.1/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&start_line=148&end_line=154

import Base
import bend-kit-collections@0.1.4.1/LAWS.bend as Laws

# lb lies below ub, when both exist.
def lt_m(~K: Data, ~cmp: K -> K -> Cmp, +lb: Maybe<&2, K>, ub: Maybe<&2, K>) -> Bool:
  match ub:
    case None{}:
      True{}
    case Some{u}:
      Laws.above(~K, ~cmp, lb, u)

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Cmp
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/LAWS.bend&name=above