(* This file is developed by Qinxiang Cao, Aquinas Hobor and Shengyi Wang in 2015. *)

Lemma range_overlap_spec: forall l1 n1 l2 n2,
n1 > 0 ->
n2 > 0 ->
(range_overlap l1 n1 l2 n2 <-> adr_range l1 n1 l2 \/ adr_range l2 n2 l1).