Specification map-ex-maplet

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enrich
   map-maplet
with
   functions 
       . =>_ : A → Map[A, B] → Bool;
   
   variables 
       o : B;
       r : A;
       h : Map[A, B];
       hP : Map[A, B] → Bool;
   
   
   axioms 
      mapex: r.=>_ = _∃(λ o. r => o);
      used for: ls;
   
   
end enrich