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Publication:3993375
zbMath0689.42002MaRDI QIDQ3993375
Publication date: 17 September 1992
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Trigonometric approximation (42A10) Multipliers in one variable harmonic analysis (42A45) Introductory exposition (textbooks, tutorial papers, etc.) pertaining to harmonic analysis on Euclidean spaces (42-01)
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Order estimates of the \(L_q\)-norms of generalized derivatives of the Dirichlet-type kernels with an arbitrary choice of harmonics ⋮ Approximation of Poisson integrals by repeated de la Vallée Poussin sums ⋮ Approximation of \((\overline\psi,\overline\beta)\)-differentiable periodic functions of many variables ⋮ Approximation of Cauchy-type integrals in Jordan domains ⋮ Estimations of the best approximations for the classes of infinitely differentiable functions in uniform and integral metrics ⋮ Order estimates for the best approximations and approximations by Fourier sums in the classes of convolutions of periodic functions of low smoothness in the uniform metric ⋮ Classes of functions defined on the real line and their approximation by entire functions. I ⋮ Uniform estimates of (\(\lambda\) ,\(\phi\) )-strong integral average deviations of Fourier operators ⋮ Estimates of the diameters of convolution classes in the spaces C and L ⋮ Approximation of classes of Poisson integrals by repeated Fejer sums ⋮ Approximation of locally integrable functions on the real line ⋮ On the approximation of the classes \(W_\beta^r H^\alpha\) by biharmonic Poisson integrals ⋮ Approximation by interpolation trigonometric polynomials on classes of periodic analytic functions ⋮ Exact values of the approximations of differentiable functions by Poisson-type integrals ⋮ Approximating characteristics of the classes \(L_{\beta,p}^\psi\) of periodic functions in the space \(L_q\) ⋮ Order estimates for the best approximations and approximations by Fourier sums of the classes of \((\psi, \beta)\)-differential functions ⋮ Uniform approximations by Fourier sums on the sets of convolutions of periodic functions of high smoothness ⋮ Approximation of classes \({C}_{\beta, \infty}^{\psi }\) by three-harmonic Poisson integrals in uniform metric (low smoothness) ⋮ Some asymptotic properties of the solutions of Laplace equations in a unit disk ⋮ Approximation of the classes \(C_{\beta}^{\psi } H^\alpha\) by biharmonic Poisson integrals ⋮ Strong summability of Fourier series of (\(\psi\) ,\(\beta\))-differentiable functions ⋮ Direct theorems on approximation of periodic functions with high generalized smoothness ⋮ Asymptotic behavior of best approximations of classes of Poisson integrals of functions from \(H_\omega\) ⋮ Lebesgue-type inequalities for the de la Valée-Poussin sums on sets of analytic functions ⋮ Strong summability of Fourier series on classes of periodic functions ⋮ Approximation of classes of analytic functions by algebraic polynomials and Kolmogorov widths ⋮ Problems of saturation of linear methods ⋮ Best trigonometric and bilinear approximations for the classes of \((\psi,\beta)\)-differentiable periodic functions ⋮ Bernstein-Nikol'skii-type inequalities for trigonometric polynomials with an arbitrary choice of harmonics ⋮ Approximation of the classes of generalized Poisson integrals by Fourier sums in metrics of the spaces \(L_S\) ⋮ Multiple Fourier sums on sets of \((\psi{},\beta{})\)-differentiable functions ⋮ Approximation by entire functions in the mean on the real line ⋮ Approximation of functions from the classes \(C_{\beta, \infty}^{\psi}\) by biharmonic Poisson integrals ⋮ Order Estimates of Best Orthogonal Trigonometric Approximations of Classes of Infinitely Differentiable Functions ⋮ Asymptotics of approximation of continuous periodic functions by linear means of their Fourier series ⋮ Approximation of the Besov classes of periodic functions of several variables in the space \(L_ q\) ⋮ Some remarks on the approximation of functions of high smoothness by Fourier operators ⋮ Approximation of functions defined on the real axis by means of de la Vallée-Poussin operators ⋮ Approximation of \((\psi, \beta)\)-differentiable functions of low smoothness by biharmonic Poisson integrals ⋮ Approximation of classes of periodic functions of several variables ⋮ Estimation of the best bilinear approximations for the classes of \((\psi, \beta)\)-differentiable periodic multivariable functions ⋮ Approximation theory and optimization problems ⋮ On the optimality of the trigonometric system ⋮ Generalized smoothness and approximation of periodic functions in the spaces \(L_p\), \(1 < p < +\infty \) ⋮ Estimates for a group of \(\varphi \) deviations and the strong summability of Taylor series of functions of class \(A ^\psi H_{\infty}(D)\) ⋮ Approximation of the classes $W^{r}_{\beta,\infty}$ by three-harmonic Poisson integrals ⋮ Mean-square rate of convergence of orthogonal series ⋮ Approximation of functions of high smoothness by Fourier sums ⋮ Uniform approximation by spherical Fourier sums on classes of functions defined by polyharmonic operators ⋮ Optimization of adaptive direct methods for the solution of operator equations in Hilbert space ⋮ Behavior of the group of derivations on sets of (\(\psi\) ,\(\beta\) )- differentiable functions ⋮ Classes of functions defined on the real axis and their approximations by entire functions. II ⋮ Approximation of weakly differentiable periodic functions ⋮ Asymptotic estimates of approximation of continuous periodic functions by Fourier sums ⋮ Uniform estimates of the integral strong mean deviations of continuous functions by entire functions ⋮ Strong mean deviations of Fourier operators ⋮ The lower estimate of deviations of Fejer sums on classes of Poisson integrals ⋮ Multiplicator type operators and approximation of periodic functions of one variable by trigonometric polynomials ⋮ Optimal approximation on \(S^d\) ⋮ Recovery of continuous functions from their Fourier coefficients known with error ⋮ Approximation properties of Poisson integrals for the classes \(C_\beta^\psi H^\alpha\) ⋮ Saturation classes of linear methods of summation of Fourier series ⋮ On Fourier coefficients of functions of class \(C^{\phi}_{\beta}H^{\omega}_ X\) ⋮ Inverse theorems on the approximation of periodic functions with high generalized smoothness
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