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Specification real-square
enrich
   real-multdiv
with
   functions 
       . ^2 : Real → Real;
   
   variables 
       i : Real;
       j : Real;
   
   partial functions 
       sqrt : Real → Real with λ i. 0.r ≤ i;
   
   axioms 
      Square-def: i.^2 = i * i;
      used for: ls;
      
      Sqrt-square: 0.r ≤ i → sqrt(i) * sqrt(i) = i;
      used for: s, ls;
      
      Sqrt-positive: 0.r ≤ i → sqrt(i) > 0.r;
      used for: s, ls;
   
   
end enrich