theorem
 for s being convergent Complex_Sequence
  holds lim (-s)*' = -(lim s)*'
proof
  let s being convergent Complex_Sequence;
  thus lim (-s)*' = (lim (-s))*' by Th11
    .= (-(lim s))*' by Th16
    .= -(lim s)*' by COMPLEX1:33;
end;
