On Hadamard composition of Gelfond-Leont'ev derivatives of entire and analytic functions in the unit disk

Abstract

For an entire function and an analytic in the unit disk function the growth of the Hadamard composition of their Gelfond-Leont'ev derivatives is investigated in terms of generalized orders. A relationship between the behaviors of the maximal terms of Hadamard composition of Gelfond-Leont'ev derivatives and of the Gelfond-Leont'ev derivative of Hadamard composition is established.

Keywords

• analytic function
• hadamard composition
• gelfond-leont'ev derivative
• maximal term