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Specification reference
specification 
      sorts 
         reference;
      constants 
         jvmref : reference; comment: Special reference for class information;
      functions 
         next : reference → reference;
      predicates 
          . < . : reference × reference;
      variables 
         r, r0, r1, r2, this : reference; 
      
      axioms 
            irreflexivity :  ⊦ ¬ r < r;
            used for : s, ls;
             
            transitivity :  ⊦ r < r0 ∧ r0 < r1 → r < r1;
            used for : f, lf;
             
            totality :  ⊦ r < r0 ∨ r = r0 ∨ r0 < r;
            no-maximum :  ⊦ ∀ r. ∃ r0. r < r0;
            smallest :  ⊦ ∀ r. ¬ r < jvmref;
            step :  ⊦ ∀ r. ∃ r0. r < r0 ∧ ¬ (∃ r1. r < r1 ∧ r1 < r0);
            next :  ⊦ r < next(r) ∧ ¬ (∃ r1. r < r1 ∧ r1 < next(r));
   
end specification