Title: Riesz sequences and generalized arithmetic progressions,
Abstract: The purpose of this note is to verify that the results attained in [6] admit
an extension to the multidimensional setting. Namely, for subsets of the two
dimensional torus we find the sharp growth rate of the step(s) of a generalized
arithmetic progression in terms of its size which may be found in an
exponential systems satisfying the Riesz sequence property.