Section MapAxioms.
Variables A B C : Type.
Definition eqmap (m m':Map A) := eqm A (MapGet A m) (MapGet A m').

Lemma MapDelta_as_Merge :
forall m m':Map A,
eqmap (MapDelta A m m')
(MapMerge A (MapDomRestrBy A A m m') (MapDomRestrBy A A m' m)).