entire symmetric functions

Factorization of Entire Symmetrical Functions of Exponential Type

Let π be an entire function of minimal type of order 1. The entire function F is called π-symmetric if it is represented in the form of a composition f ◦ π, where the f is an entire function. The article deals with the following question. Can we present every π-symmetric function of exponential type as a product of two functions with a close growth, each of which is itself an entire π-symmetric function?