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 Conditions for the finiteness of majorants for sequences of operators and convergence of Fourier seriesN. Yu. Antonov 3 Turán's problem for positive definite functions with supports in a hexagonV. V. Arestov, E. E. Berdysheva 21 On the Jackson–Stechkin inequality for the best $L^2$-approximations of functions by trigonometric polynomialsA. G. Babenko 30 Orders of the weighted Lebesgue constants for Fourier sums with respect to orthogonal polynomialsV. M. Badkov 47 The Jackson–Stechkin inequality with a nonclassic modulus of continuityN. A. Baraboshkina 62 Introducing an equivalent metric in a linear space by a family of its subsetsA. I. Vasil'ev 67 The Jackson–Stechkin inequality in $L_2[-\pi,\pi]$S. N. Vasil'ev 75 Weak perturbations of solutions with movable singularitiesL. A. Kalyakin 85 Asymptotics of a solution of the Kadomtsev-Petviashvili-2 equationO. M. Kiselev 105 The error of interpolation of functions by polynomials on $n$-simplexesA. G. Kuptsova 135 A problem of extremal interpolation for multivariate functionsS. I. Novikov, V. T. Shevaldin 144 On the Ostrovskii–Peresyolkova conjecture about zeros of the Mittag-Leffler functionsA. Yu. Popov 160 Approximative properties of interpolating $\mathcal L$-splinesA. A. Sazanov 175 Trigonometric series with monotone type coefficientsS. B. Stechkin 197 Splines and relative widths of classes of differentiable functionsYu. N. Subbotin, S. A. Telyakovskii 208 Wavelets which are orthonormal with respect to an inner product in the Sobolev space $W_2^m$ of periodic functionsYu. N. Subbotin, N. I. Chernykh 217 The Jackson–Stechkin inequality in the space $C(\mathbb T)$ with trigonometric continuity modulus annihilating the first harmonicsV. T. Shevaldin 231 Errata: “Control of motion of multilink systems over a rough plane”F. L. Chernous'ko 238