Confining Dirac delta-shell operators, previously inaccessible, are shown to be norm resolvent limits of strongly localized potentials with diverging interaction strengths.
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Approximation of Dirac operators with confining electrostatic and Lorentz scalar $\delta$-shell potentials
Confining Dirac delta-shell operators, previously inaccessible, are shown to be norm resolvent limits of strongly localized potentials with diverging interaction strengths.