Spectral theory and differential operators
Spectral theory and differential operators
Interpolation of operators
Full length article: Approximation schemes satisfying Shapiro's Theorem
Journal of Approximation Theory
Journal of Approximation Theory
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We characterise Besov spaces with positive smoothness on R^n, obtained by different approaches. First we present two settings B"p","q^s(R^n), B"p","q^s(R^n) associated to definitions by differences and Fourier-analytical methods and give an equivalent characterisation in terms of subatomic decompositions for the spaces B"p","q^s. We study their connections and diversity, as well as embeddings between Besov spaces and into Lorentz spaces. Secondly, we determine their growth envelopes E"G(B"p","q^s(R^n)) for 00, and finally discuss some applications.