Specification int-basic2

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enrich
   int-basic1
with
   functions 
       . + . : Int × Int → Int;
   
   variables 
       i : Int;
       j : Int;
   
   axioms 
      add-zero: i + 0 = i;
      
      add-succ: i + j.+1 = (i + j).+1;
      
      add-pred: i + j.-1 = (i + j).-1;
   
   
end enrich