Abstract
In this paper we are concerned with Triebel–Lizorkin–Morrey spaces \({\mathcal {E}}^{s}_{u,p,q}(\Omega )\) of positive smoothness s defined on (special or bounded) Lipschitz domains \(\Omega \subset {{\mathbb {R}}}^{d}\) as well as on \({{\mathbb {R}}}^{d}\). For those spaces we prove new equivalent characterizations in terms of local oscillations which hold as long as some standard conditions on the parameters are fulfilled. As a byproduct, we also obtain novel characterizations of \({\mathcal {E}}^{s}_{u,p,q}(\Omega )\) using differences of higher order. Special cases include standard Triebel–Lizorkin spaces \(F^s_{p,q} (\Omega )\) and hence classical \(L_p\)-Sobolev spaces \(H^s_p(\Omega )\).
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Acknowledgements
The authors are grateful to Winfried Sickel and Stephan Dahlke for several valuable discussions. Moreover, they like to thank the two anonymous reviewers for their constructive criticism.
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Marc Hovemann has been supported by Deutsche Forschungsgemeinschaft (DFG), grant DA 360/24-1.
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Marc Hovemann has been supported by Deutsche Forschungsgemeinschaft (DFG), grant DA 360/24-1.
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Hovemann, M., Weimar, M. Oscillations and differences in Triebel–Lizorkin–Morrey spaces. Rev Mat Complut (2024). https://doi.org/10.1007/s13163-024-00487-4
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DOI: https://doi.org/10.1007/s13163-024-00487-4