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Specification existential
generic specification
   

   
parameter
   elem

   using heap-sep
target
   
   
   functions  _∃ . : (elem → heap → bool) → heap → bool;
   
   
   variables  Pa : elem → heap → bool;
   
   

   

   axioms exists :  ⊦ (_∃ Pa)(H) ↔ (∃ a. Pa(a)(H));
          used for: s, ls;

   

   
end generic specification