Mixed norm n n -widths
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Recently, the Soviet mathematicians R. Ismagilov , E. Gluskin  and B. Kashin  have obtained some deep and surprising results on n-widths for Sobolev spaces in the mixed norm case. In this note, we will give a new and simpler proof of Gluskin’s result and show its connection with a certain classical combinatorial problem. © 1980 American Mathematical Society.
author list (cited authors)
de Boor, C., DeVore, R., & Höllig, K.