On Estimates of the Rate of Equiconvergence of SpectralExpansions for the Dirac System with a Summable Potential

This article is devoted to estimating the rate of equiconvergence of spectral expansions for the Dirac system on a finite interval. The potential of the operator is assumed to be summable, and the boundary conditions are Birkhoff-regular. Results are obtained for the case where the expanded function $$ f$$ is square summable, and qualified estimates of the equiconvergence rate are separately provided for the case of a square-summable potential and a function $$f $$ from the scale of Sobolev spaces.