2017/10/13 by Veliev, O. A.
#FOS: Mathematics #Spectral Theory (math.SP)
paper · doi:10.48550/arxiv.1710.05767
In this paper we find explicit conditions on the periodic PT-symmetric complex-valued potential q for which the number of gaps in the real part of the spectrum of the one-dimensional Schrodinger operator L(q) is finite.