Specification verification

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enrich
   instance
with
   

   
   
   
   predicates  inv : nat × nat × nat × nat;
               rely : nat × nat × nat × nat;
   
   variables  n' : nat;
              m' : nat;

   

   axioms inv :  ⊦ inv(n0, m0, n, m) ↔ gcd(n0, m0) = gcd(n, m);
          used for: s, ls;
          rely :  ⊦ rely(n, m, n', m') ↔ ¬ ¬(m' = m ∧ n' ≤ n ∧ (n ≤ m → n' = n));
          used for: s, ls;

   

   
end enrich