Elementary doublets of bound states of the radial Dirac equation
Abstract
For non-relativistic Schroedinger equations the lowering of their degree by substitution Psi(r) F(r) =Psi'(r) /Psi(r) is known to facilitate our understanding and use of their (incomplete, so called quasi-exact) solvability. We show that and how the radial Dirac relativistic equation may quasi-exactly be solved in similar spirit.
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