Specification int-basic2

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enrich
   int-basic1
with
   

   
   
   functions  . + . : int × int → 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