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;

theorem Th110:
  for f being FinSequence st len f=1 holds Rev f=f
proof
  let f be FinSequence;
  assume len f=1;
  then f=<*f.1*> by FINSEQ_1:40;
  hence thesis by FINSEQ_5:60;
end;
