We provide sufficient conditions for a sequence of positive linear approximation operators, L n ( f, x), converging to f (x) from above to imply the convexity of f. We show that, for the convolution operators of Feller type, K n ( f, x), generated by a sequence of iid random variables taking values
NOTE: On the Degree ofLpApproximation with Positive Linear Operators
β Scribed by J.J. Swetits; B. Wood
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 173 KB
- Volume
- 87
- Category
- Article
- ISSN
- 0021-9045
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β¦ Synopsis
The degree of approximation in L p -spaces by positive linear operators is estimated in terms of the integral modulus of smoothness. It is shown that the conjectured optimal degree of approximation is not attained in the class of functions having a second derivative belonging to L p .
π SIMILAR VOLUMES
The Schur sufficiency condition for boundedness of any integral operator with non-negative kernel between L 2 -spaces is deduced from an observation, Proposition 1.2, about the central role played by L 2 -spaces in the general theory of these operators. Suppose (0, M, +) is a measure space and that