Geodesic
On the basis property of the system of eigenfunctions and associated functions
Izvestiya. Mathematics , Tome 82 (2018) no. 2, pp. 351-376

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We study a one-dimensional Dirac system on a finite interval. The potential (a $2\times 2$ matrix) is assumed to be complex-valued and integrable. The boundary conditions are assumed to be regular in the sense of Birkhoff. It is known that such an operator has a discrete spectrum and the system $\{\mathbf{y}_n\}_1^\infty$ of its eigenfunctions and associated functions is a Riesz basis (possibly with brackets) in $L_2\oplus L_2$. Our results concern the basis property of this system in the spaces $L_\mu\oplus L_\mu$ for $\mu\ne2$, the Sobolev spaces ${W_2^\theta\oplus W_2^\theta}$ for $\theta\in[0,1]$, and the Besov spaces $B^\theta_{p,q}\oplus B^\theta_{p,q}$.
Keywords: Dirac operator, eigenfunctions and associated functions, conditional basis, Riesz basis. 
@article{IM2_2018_82_2_a4,
     author = {A. M. Savchuk},
     title = {On the basis property of the system of eigenfunctions and associated functions},
     journal = {Izvestiya. Mathematics },
     pages = {351--376},
     publisher = {mathdoc},
     volume = {82},
     number = {2},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2018_82_2_a4/}
}
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A. M. Savchuk. On the basis property of the system of eigenfunctions and associated functions. Izvestiya. Mathematics , Tome 82 (2018) no. 2, pp. 351-376. http://geodesic.mathdoc.fr/item/IM2_2018_82_2_a4/