reserve a,b,i,j,k,l,m,n for Nat;

theorem FLS:
  for f,g be complex-valued FinSequence holds len (f + g) = min (len f,len g)
  proof
    let f,g be complex-valued FinSequence;
    reconsider h = f+g as FinSequence of COMPLEX by NEWTON02:103;
    dom h = dom f /\ dom g by VALUED_1:def 1;
    hence thesis by DLS;
  end;
