(*Expresses that the evolution soundly and completely tracks what happened during
  related coresteps. sm_locally_allocated is typically be used in conjunction with
  intern_incr, so extern mu = extern mu', and equalities
  (pSrc,pTgt,fSrc,fTgt)=(pSrc',pTgt',fSrc',fTgt') hold, too.*)
Definition sm_locally_allocated (mu mu' : SM_Injection) (m1 m2 m1' m2':mem):Prop :=
  match mu, mu' with
     Build_SM_Injection locBSrc locBTgt pSrc pTgt local extBSrc extBTgt fSrc fTgt extern,
     Build_SM_Injection locBSrc' locBTgt' pSrc' pTgt' local' extBSrc' extBTgt' fSrc' fTgt' extern'
  =>    locBSrc' = (fun b => orb (locBSrc b) (freshloc m1 m1' b))
     /\ locBTgt' = (fun b => orb (locBTgt b) (freshloc m2 m2' b))
     /\ extBSrc' = extBSrc
     /\ extBTgt' = extBTgt
  end.

Lemma sm_inject_separated_intern_MYB: forall mu mu' m1 m2 m1' m2' (SEP: sm_inject_separated mu mu' m1 m2) (LAL: sm_locally_allocated mu mu' m1 m2 m1' m2'), (forall b, locBlocksSrc mu b = false -> locBlocksSrc mu' b = true -> ~ Mem.valid_block m1 b) /\ (forall b, locBlocksTgt mu b = false -> locBlocksTgt mu' b = true -> ~ Mem.valid_block m2 b).