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1. CJM 1997 (vol 49 pp. 74)

Hu, Y. K.; Kopotun, K. A.; Yu, X. M.
Constrained approximation in Sobolev spaces
Positive, copositive, onesided and intertwining (co-onesided) polynomial and spline approximations of functions $f\in\Wp^k\mll$ are considered. Both uniform and pointwise estimates, which are exact in some sense, are obtained.

Keywords:Constrained approximation, polynomials, splines, degree of, approximation, $L_p$ space, Sobolev space
Categories:41A10, 41A15, 41A25, 41A29

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