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Intertwining relations of non-stationary Schrödinger operators
General first- and higher-order intertwining relations between non-stationary one-dimensional Schrödinger operators are introduced. For the first-order case it is shown that the intertwining relations imply some hidden symmetry which in turn results in an R-separation of variables. The Fokker-Planck and diffusion equations are briefly considered. Second-order intertwining operators are also …