On the real projections of zeros of almost periodic functions

This paper deals with the set of the real projections of the zeros of an arbitrary almost periodic function defined in a vertical strip $U$. It provides practical results in order to determine whether a real number belongs to the closure of such a set. Its main result shows that, in the case that the Fourier exponents $\{{\lambda }_1,{\lambda }_2,{\lambda }_3,\dots \}$ of an almost periodic function are linearly independent over the rational numbers, such a set has no isolated points in $U$.