Nonharmonic analysis of boundary value problems without WZ condition

@article{Ruzhansky2016NonharmonicAO,
  title={Nonharmonic analysis of boundary value problems without WZ condition},
  author={Michael Ruzhansky and Niyaz Tokmagambetov},
  journal={Mathematical Modelling of Natural Phenomena},
  year={2016},
  volume={12},
  pages={115-140}
}
In this work we continue our research on nonharmonic analysis of boundary value problems as initiated in [8]. There, we assumed that the eigenfunctions of the model operator on which the construction is based do not have zeros. In this paper we have weakened this condition extending the applicability of the developed pseudo-differential analysis. Also, we do not assume that the underlying set Omega is bounded. 
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