On properties of functions invertible in the sense of Ehrenpreis in the Schwartz algebra

We consider those elements of the Schwartz algebra of entire functions which are the Fourier-Laplace transforms of invertible distributions with compact supports on the real line. These functions are called invertible in the sense of Ehrenpreis. The first of the presented results is about the properties of zero subsets of invertible in the sense of Ehrenpreis function $f$. Namely, we establish some properties of the zero subset formed by zeros of $f$ laying not far from the real axis. We also obtain estimates from below for $|f|$ which generalize the corresponding ones in the definition of the notion of sine-type functions.