Abstract
We give Littlewood–Paley type characterizations for Besov–Triebel–Lizorkin–type spaces \(\mathscr {B}_{pq}^{s\tau },\mathscr {F}_{pq}^{s\tau }\) and Besov-Morrey spaces \(\mathcal N_{uqp}^s\) on a special Lipschitz domain \(\Omega \subset \mathbb R^n\): for a suitable sequence of Schwartz functions \((\phi _j)_{j=0}^\infty \),
We also show that \(\Vert f\Vert _{\mathscr {B}_{pq}^{s\tau }(\Omega )}\), \(\Vert f\Vert _{\mathscr {F}_{pq}^{s\tau }(\Omega )}\) and \(\Vert f\Vert _{\mathcal N_{uqp}^{s}(\Omega )}\) have equivalent (quasi-)norms via derivatives: for \(\mathscr {X}^\bullet \in \{\mathscr {B}_{pq}^{\bullet ,\tau },\mathscr {F}_{pq}^{\bullet ,\tau },\mathcal N_{uqp}^\bullet \}\), we have \(\Vert f\Vert _{\mathscr {X}^s(\Omega )}\approx \sum _{|\alpha |\le m}\Vert \partial ^\alpha f\Vert _{\mathscr {X}^{s-m}(\Omega )}\). In particular \(\Vert f\Vert _{\mathscr {F}_{\infty q}^s(\Omega )}\approx \sum _{|\alpha |\le m}\Vert \partial ^\alpha f\Vert _{\mathscr {F}_{\infty q}^{s-m}(\Omega )}\approx \sup _{P}|P|^{-n/q}\Vert (2^{js}\phi _j*f)_{j=\log _2\ell (P)}^\infty \Vert _{\ell ^q(L^q(\Omega \cap P))}\).
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Notes
The half space extension works on \(\mathbb {R}^n_+=\{x_n>0\}\). It has the form \(Ef(x',x_n)=\sum _ja_jf(x',-b_jx_n)\) when \(x_n<0\). In this case \(E^\alpha f(x',x_n)=\sum _ja_j(-b_j)^{\alpha _n}f(x',-b_jx_n)\) has the similar expression to E.
Our notation is different from the standard one, which can be found in for example [20, Definition 2.1].
Some papers may have different order of the indices. For example, in [7] this is written as \(\mathcal {N}_{upq}^s\).
The notation is slightly different from the one in [12, Theorem 1.2].
It can depend on the upper bound of \(\Vert \nabla \rho \Vert _{L^\infty }\), which is bounded by \(\inf \{-\frac{x_n}{|x'|}:(x',x_n)\in {\text {supp}}\phi _j\}\) where \(\phi \in \{\eta ,\theta \}\) and \(j\ge 0\).
In fact we can relax the condition to \(\sum _{\nu =1}^N\chi _\nu |_{\overline{\Omega }}>c\) for some \(c>0\).
Here the index of the Schwartz family start from \(j=1\). In Definition 5 we start with \(j=0\).
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Acknowledgements
I would like to thank Dorothee Haroske, Wen Yuan and Ciqiang Zhuo for their informative discussions and advice. I would also like to thank the referees for the comments and suggestions.
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Communicated by Winfried Sickel.
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Yao, L. Some Intrinsic Characterizations of Besov–Triebel–Lizorkin–Morrey–Type Spaces on Lipschitz Domains. J Fourier Anal Appl 29, 24 (2023). https://doi.org/10.1007/s00041-023-10001-x
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DOI: https://doi.org/10.1007/s00041-023-10001-x
Keywords
- Rychkov’s extension operator
- Lipschitz domains
- Besov-type space
- Triebel–Lizorkin-type space
- Besov–Morrey space