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\(n\)-th width in Sobolov spaces. (\(n^{\text{ième}}\) épaisseur dans les espaces de Sobolev.) (French) Zbl 0225.41003

MSC:
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
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