FA Bhat - Complex Analysis and its Synergies, 2022 - Springer
If P (z)= an∏ j= 1 n (z-zj) is a complex polynomial of degree n having all its zeros in| z|≤ K,
K≥ 1, it is known that max| z|= 1| P′(z)|≥ 2 1+ K n∑ j= 1 n KK+| zj| max| z|= 1| P (z)|. In this …