Specification olist-min-max

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enrich
   olist-sort
with
   

   
   
   functions  min : list → elem;
              max : list → elem;
   
   
   
   
   

   

   axioms min-base :  ⊦ min(a ') = a;
          used for: s, ls;
          min-rec :  ⊦ x ≠ [] → min(a ' + x) = (a < min(x) ⊃ a;min(x));
          max-base :  ⊦ max(a ') = a;
          used for: s, ls;
          max-rec :  ⊦ x ≠ [] → max(a ' + x) = (max(x) < a ⊃ a;max(x));

   

   
end enrich