Specification list-setequal

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enrich
   list-set
with
   

   
   
   
   predicates  . ≡ . : list × list;
   
   
   
   

   

   axioms setequal-def :  ⊦ x ≡ y ↔ ¬ ¬(x ⊆ y ∧ y ⊆ x);
          used for: ls;

   

   
end enrich