Geodesic
Optimal Calder\'on Spaces for Generalized Bessel Potentials
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Function Spaces, Approximation Theory, and Related Problems of Analysis, Tome 312 (2021), pp. 43-81

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We investigate the properties of spaces with generalized smoothness, such as Calderón spaces, that include the classical Nikolskii–Besov spaces and many of their generalizations, and describe differential properties of generalized Bessel potentials that include classical Bessel potentials and Sobolev spaces. The kernels of potentials may have non-power singularities at the origin. Using order-sharp estimates for the moduli of continuity of potentials, we establish criteria for the embeddings of potentials into Calderón spaces and describe the optimal spaces for such embeddings. 
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     author = {Elza G. Bakhtigareeva and Mikhail L. Goldman and Dorothee D. Haroske},
     title = {Optimal {Calder\'on} {Spaces} for {Generalized} {Bessel} {Potentials}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {43--81},
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     volume = {312},
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     url = {http://geodesic.mathdoc.fr/item/TM_2021_312_a2/}
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Elza G. Bakhtigareeva; Mikhail L. Goldman; Dorothee D. Haroske. Optimal Calder\'on Spaces for Generalized Bessel Potentials. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Function Spaces, Approximation Theory, and Related Problems of Analysis, Tome 312 (2021), pp. 43-81. http://geodesic.mathdoc.fr/item/TM_2021_312_a2/