Specification array-listops

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enrich
   array-copy
with
   constants 
       [] : array;
   
   functions 
       . + . : elem × array → array;
   
   predicates 
       . < . : array × array;
   
   variables 
       ar : array;
       a : elem;
       n : nat;
   
   partial functions 
       . .first : array → elem with λ ar. ar ≠ [];
       . .rest : array → array with λ ar. ar ≠ [];
   
   
   axioms 
      nil: [] = mkarray(0);
      
      cons: a + ar = copy(ar, 0, mkarray(# ar + 1), 1, # ar)[0, a];
      
      first: ar.first = ar[0];
      
      rest: ar.rest = subarray(ar, 1, # ar - 1);
      
      postfix: ar0 < ar1 ↔ # ar0 < # ar1 ∧ ar0 = subarray(ar1, # ar1 - # ar0, # ar0);
   
   
end enrich