reserve r,lambda for Real,
  i,j,n for Nat;
reserve p,p1,p2,q1,q2 for Point of TOP-REAL 2,
  P, P1 for Subset of TOP-REAL 2;
reserve T for TopSpace;

theorem Th23:
  for f being FinSequence of TOP-REAL n holds len f >= 2 implies L~f <> {}
proof
  let f be FinSequence of TOP-REAL n;
  assume
A1: len f >= 2;
  then not len f = 1;
  hence thesis by A1,Th22;
end;
