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We characterize the K-functionals for certain pairs of univariate function

By Ronald A. Devore, Xiang, Ming Yij and Communicuted Zeev Ditzian


The K-functional was introduced by J. Peetre as a means of generating interpolation spaces. If X0, X, is a pair of quasi-normed spaces which are continuously embedded in a Hausdorff space X, then their K-functional, defined for all f ~ X0 + X, , i

Year: 1990
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