Exact values of the best mean approximations by algebraic polynomials of $W^r_L$ classes ($r=1,2$)
In the paper, we have found the supremum of the best mean approximations by algebraic polynomials of differentiable functions from $W^r_L$ classes for $r=1,2$.
1984 ◽
Vol 23
(2)
◽
pp. 353-365
◽
1981 ◽
Vol 32
(1)
◽
pp. 1-8
◽