Definition ContentsMap_EI_FUN (j:meminj) (m1 m1' m2:Mem.mem) (b:block):
            ZMap.t memval.

Lemma ContentsMap_EI_existsT: forall (j:meminj) (m1 m1' m2:Mem.mem), { M : PMap.t (ZMap.t memval) | fst M = ZMap.init Undef /\ forall b, PMap.get b M = ContentsMap_EI_FUN j m1 m1' m2 b}.