Stability of spectral characteristics and Bari basis property of boundary value problems for $2 \times 2$ Dirac type systems
2020
The paper is concerned with the stability property under perturbation $Q\to\widetilde Q$ of different spectral characteristics of a BVP associated in $L^2([0,1];\Bbb C^2)$ with the following $2\times2$ Dirac type equation $$L_U(Q)y=-iB^{-1}y'+Q(x)y=\lambda y,\quad B={\rm diag}(b_1,b_2),\quad b_1<0
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