“…We can estimate the number of isolated zeros of M 1 (i.e., M1 ) now. We limit to some number of separation redials, where four of them have appeared in the references [1,4,5,10,29,36,37] (see statements (i)-(iv) of Proposition 19 and Figure 1), and two new ones (statements (v) and (vi)) are added now for the first time, which exhibits some clues that how the maximum number of isolated zeros of M 1 can be affected by the number n and the distribution of the angles ϑ 0 , • • • , ϑ n . Proposition 19.…”