reserve x,y,z for set;
reserve f,f1,f2,f3 for FinSequence,
  p,p1,p2,p3 for set,
  i,k for Nat;
reserve D for non empty set,
  p,p1,p2,p3 for Element of D,
  f,f1,f2 for FinSequence of D;
reserve D for non empty set;
reserve p, q for FinSequence,
  X, Y, x, y for set,
  D for non empty set,
  i, j, k, l, m, n, r for Nat;
reserve a, a1, a2 for TwoValued Alternating FinSequence;
reserve fs, fs1, fs2 for FinSequence of X,
  fss, fss2 for Subset of fs;

theorem
  for f being FinSequence holds f^'<*x*> = f
proof
  let f be FinSequence;
  len <*x*> = 1 by FINSEQ_1:39;
  then (2, len <*x*>)-cut <*x*> = {} by Def1;
  hence thesis by FINSEQ_1:34;
end;
