On converse approximation theorems

An Inversion Formula for Laplace Transforms and Semi-Groups of Linear Operators

Ralph S. Phillips · Annals of Mathematics · 1954 · 117 citations

Natural Sciences, Mathematics, Dynamical Systems +15

On Phillips operator

Courtney May · Journal of Approximation Theory · 1977 · 58 citations

Approximation of Unbounded Functions by a New Sequence of Linear Positive Operators

P. Ν. Agrawal, Kareem J. Thamer · Journal of Mathematical Analysis and Applications · 1998 · 37 citations

Natural Sciences, Mechanical Engineering, Time Series Analysis +13

Local and Global Approximation Theorems for Positive Linear Operators

Michael Felten · Journal of Approximation Theory · 1998 · 34 citations

Natural Sciences, Mathematics, Dynamical Systems +11

Strong Converse Inequalities

Journal of Approximation Theory · 1994 · 28 citations