Approximation theory and extremal problems in Hilbert spaces

1971 ◽  
pp. 81-116
Author(s):  
Harold S. Shapiro
Keyword(s):  
Approximation Theory ◽  
Hilbert Spaces ◽  
Extremal Problems

Extremal problems of approximation theory in fuzzy context

1999 ◽  
Vol 105 (2) ◽  
pp. 249-257 ◽  
Author(s):  
Svetlana V. Asmuss ◽  
Alexander P. Šostak
Keyword(s):  
Approximation Theory ◽  
Extremal Problems

scholarly journals On extremal problems of approximation theory for classes of functions of two discrete variables in $l^2_{q,p}$

2021 ◽  
Vol 15 ◽  
pp. 60
Author(s):  
S.B. Vakarchuk ◽  
M.B. Vakarchuk
Keyword(s):  
Approximation Theory ◽  
Extremal Problems ◽  
Discrete Variables ◽  
Periodic Functions

For classes of $2\pi$-periodic functions of two discrete variables, defined on grid set $\sigma_{q,p}$, we found exact values of Kolmogorov and linear quasiwidths of classes $W^{r,p}(l^2_{q,p})$ in $l^2_{q,p}$ space.

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