Specification infset-union

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enrich
   infset-basic
with
   functions 
       { . } : 'a → iset('a);
       . ∪ . : iset('a) × iset('a) → iset('a);
       . ∩ . : iset('a) × iset('a) → iset('a);
       . \ . : iset('a) × iset('a) → iset('a);
       . -- . : iset('a) × 'a → iset('a) prio 9 left;
   
   variables 
       a : 'a;
       b : 'a;
       c : 'a;
       s : iset('a);
   
   
   axioms 
      One: {a}  = ∅ ++ a;
      used for: s, ls;
      
      Union: a ∈ s1 ∪ s2 ↔ a ∈ s1 ∨ a ∈ s2;
      used for: ws, ls;
      
      Intersect: a ∈ s1 ∩ s2 ↔ a ∈ s1 ∧ a ∈ s2;
      used for: ws, ls;
      
      Difference: a ∈ s1 \ s2 ↔ a ∈ s1 ∧ ¬ a ∈ s2;
      used for: ws, ls;
      
      Delete: a ∈ s -- b ↔ a ≠ b ∧ a ∈ s;
      used for: s, ls;
   
   
end enrich