Specification open-file-handles-ext

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enrich
   open-file-handles

with
   

   
   
   functions  max : open-file-handles → nat;
   
   
   
   
   

   

   axioms max-empty :  ⊦ max(∅) = 0;
          used for: ls;
          max-rec :  ⊦ max(ofh[fd, fh]) = (fd > max(ofh) ⊃ fd;max(ofh));
          used for: ls;

   

   
end enrich