Stability of spectral characteristics and Bari basis property of boundary value problems for $2\times 2$ Dirac type systems

Anton A. Lunyov, Mark M. Malamud

The paper is concerned with the stability property under perturbation $Q\to \tilde{Q}$ of different spectral characteristics of a BVP associated in $L^2([0,1];{\mathbb{C}}^2)$ with the…