Specification infset-union

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enrich
   infset-basic
with
   functions 
       { . } : Elem → Set;
       . ∪ . : Set × Set → Set;
       . ∩ . : Set × Set → Set;
       . \ . : Set × Set → Set;
       . -- . : Set × Elem → Set prio 9 left;
   
   variables 
       a : Elem;
       b : Elem;
       c : Elem;
       s : Set;
   
   
   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