Properties of local orthonormal systems, Part III: Variation spaces

Jacek Gulgowski, Anna Kamont, Markus Passenbrunner

In [Y.~K.~Hu, K.~A.~Kopotun, X.~M.~Yu, Constr. Approx. 2000], the authors have obtained a characterization of best $n$-term piecewise polynomial approximation spaces as real interp…