reserve i,j,k,l for natural Number;
reserve A for set, a,b,x,x1,x2,x3 for object;
reserve D,D9,E for non empty set;
reserve d,d1,d2,d3 for Element of D;
reserve d9,d19,d29,d39 for Element of D9;
reserve p,q,r for FinSequence;

theorem Th87:
  for D being set holds D* is FinSequenceSet of D
proof
  let D be set;
  D* is FinSequenceSet of D
  proof
    let a;
    thus thesis by FINSEQ_1:def 11;
  end;
  hence thesis;
end;
