reserve i,j,k,n for Nat;
reserve x,x1,x2,x3,y1,y2,y3 for set;

theorem Th19:
  for n be Nat holds the carrier of Necklace n = n
proof
  let n be Nat;
  the carrier of Necklace n = the carrier of n-SuccRelStr by Def7
    .= n by Def6;
  hence thesis;
end;
