Abstract:
Let $u\not\equiv-\infty$ be a subharmonic function in the complex plane. We establish necessary and/or sufficient conditions for the existence of a nonzero entire function $f$ for which the modulus of the product of each of its $k$th derivative $k=0,1,\dots$, by any polynomial $p$ is not greater than the function $Ce^u$ in the entire complex plane, where $C$ is a constant depending on $k$ and $p$. The results obtained significantly strengthen and develop a number of results of Lars Hörmander (1997).
Keywords:entire function, subharmonic function, integral mean, Riesz measure, counting function.