On Bernstein-type inequalities for the polar derivative of a polynomial
NK Govil, P Kumar - Progress in Approximation Theory and Applicable …, 2017 - Springer
If P (z) is a polynomial of degree n, and α a complex number, then polar derivative of P (z)
with respect to the point α, denoted by D α P (z), is defined by D α P (z)= n P (z)+(α− z) …
with respect to the point α, denoted by D α P (z), is defined by D α P (z)= n P (z)+(α− z) …