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    • on the Levinson theorem for Dirac operators 

      Klaus, M. (AIP Publishing, 1990-01)
      For the Dirac equation with potential V(r) obeying ∫∞ 0(1+r)‖V(r)‖d r<∞ we prove a relativistic version of Levinson’s theorem that relates the number of bound states in the spectral gap [−m,m] to the variation of an ...