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Accumulation of complex eigenvalues of indefinite Sturm–Liouville operators
Spectral properties of singular Sturm-Liouville operators of the form A = sgn (•)(-d 2dx 2 + V ) with the indefinite weight x → sgn (x) on R are studied.For a class of potentials with lim |x|→∞ V (x) = 0 the accumulation of complex and real eigenvalues of A …