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The following pages link to Estimates of the best approximations of periodic functions by trigonometric polynomials in terms of averaged differences and the multidimensional Jackson's theorem (Q4376813):

Displaying 13 items.

Generalized smoothness characteristics in Jackson-type inequalities and widths of classes of functions in $L_2$ (Q276675) (← links)
Inequalities between best polynomial approximations and some smoothness characteristics in the space $L_2$ and widths of classes of functions (Q295993) (← links)
Estimates for the best approximations of a periodic function by linear combinations of values of the function and its primitives (Q378652) (← links)
Estimates for the best approximations of periodic functions in terms of deviations (Q467567) (← links)
The multidimensional Jackson theorem in $L_ p$ (Q1206243) (← links)
Jackson-type inequalities with generalized modulus of continuity and exact values of the $n$-widths for the classes of $(\psi,\beta)$-differentiable functions in $L_2$. III (Q1729361) (← links)
Some inequalities between the best polynomial approximations and averaged finite-difference norms in space $L_2$ (Q2066418) (← links)
On moduli of smoothness and averaged differences of fractional order (Q2402336) (← links)
Exact constants in Jackson-type inequalities for the best mean square approximation in $L_2(\mathbb{R})$ and exact values of mean $\nu$-widths of the classes of functions (Q2404930) (← links)
Inequalities between best polynomial approximants and smoothness characteristics of functions in $L_2$ (Q2666611) (← links)
One‐Sided Trigonometric Approximation in Metrics of the Fréchet Spaces Lp (0 < p < 1) (Q3700221) (← links)
Jackson-Stechkin Inequality and Values of Widths of Some Classes of Functions in $L_2$ (Q5039335) (← links)
Approximation in the mean for the classes of functions in the space $L_2[(0, 1); x]$ by the Fourier-Bessel sums and estimation of the values of their $n$-widths (Q6597869) (← links)