Optimization Letters.
Vol. 11.
2017.
P. 1201-1215
We consider two families of realizations of the 2p×2p–Dirac differential expression with point interactions on a discrete set X = {xn}n=1 ∞ ⊂ ℝ on a half–line (line) and generalize certain results from [10] to the matrix case. We show that these realizations are always self-adjoint. We investigate the nonrelativistic limit as the velocity of light tends to infinity. © 2017, Pleiades Publishing, Ltd.