theorem Th16:
  for s being convergent Complex_Sequence
  holds lim(-s)=-(lim s)
proof
  let s being convergent Complex_Sequence;
   lim(-s) = (-1)*(lim s) by Th14
    .= - 1r*(lim s) by COMPLEX1:def 4;
  hence thesis by COMPLEX1:def 4;
end;
