Definition PMap_eq {A} (m m' : PMap.t (Z -> A)) := forall b' ofs', m !! b' ofs' = m' !! b' ofs'.

Lemma find_too_small A y a x l :
(AddressOrdered.lt y a \/ AddressOrdered.eq y a) ->
Sorted (AMap.Raw.PX.ltk (elt:=A)) l ->
HdRel (AMap.Raw.PX.ltk (elt:=A)) (a, x) l ->
AMap.Raw.find (elt:=A) y l = None.