Geodesic
Equivalent conditions for the validity of the Helmholtz decomposition of Muckenhoupt $A_{p}$-weighted $L^{p}$-spaces
Czechoslovak Mathematical Journal, Tome 68 (2018) no. 3, pp. 771-789 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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We discuss the validity of the Helmholtz decomposition of the Muckenhoupt $A_{p}$-weighted $L^{p}$-space $(L^{p}_{w}(\Omega ))^{n}$ for any domain $\Omega $ in $\mathbb {R}^{n}$, $n \in \mathbb {Z}$, $n\geq 2$, $1
We discuss the validity of the Helmholtz decomposition of the Muckenhoupt $A_{p}$-weighted $L^{p}$-space $(L^{p}_{w}(\Omega ))^{n}$ for any domain $\Omega $ in $\mathbb {R}^{n}$, $n \in \mathbb {Z}$, $n\geq 2$, $1$ and Muckenhoupt $A_{p}$-weight $w \in A_{p}$. Set $p':={p}/{(p-1)}$ and $w':=w^{-{1}/{(p-1)}}$. Then the Helmholtz decomposition of $(L^{p}_{w}(\Omega ))^{n}$ and $(L^{p'}_{w'}(\Omega ))^{n}$ and the variational estimate of $L^{p}_{w,\pi }(\Omega )$ and $L^{p'}_{w',\pi }(\Omega )$ are equivalent. Furthermore, we can replace $L^{p}_{w,\pi }(\Omega )$ and $L^{p'}_{w',\pi }(\Omega )$ by $L^{p}_{w,\sigma }(\Omega )$ and $L^{p'}_{w',\sigma }(\Omega )$, respectively. The proof is based on the reflexivity and orthogonality of $L^{p}_{w,\pi }(\Omega )$ and $L^{p}_{w,\sigma }(\Omega )$ and the Hahn-Banach theorem. As a corollary of our main result, we obtain the extrapolation theorem with the aid of the Helmholtz projection of $(L^{p}_{w}(\Omega ))^{n}$.
DOI : 10.21136/CMJ.2018.0646-16
Classification : 35Q30, 46E30, 76D05
Keywords: Helmholtz decomposition; Muckenhoupt $A_{p}$-weighted $L^{p}$-spaces; variational estimate 
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     title = {Equivalent conditions for the validity of the {Helmholtz} decomposition of {Muckenhoupt} $A_{p}$-weighted $L^{p}$-spaces},
     journal = {Czechoslovak Mathematical Journal},
     pages = {771--789},
     year = {2018},
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Kakizawa, Ryôhei. Equivalent conditions for the validity of the Helmholtz decomposition of Muckenhoupt $A_{p}$-weighted $L^{p}$-spaces. Czechoslovak Mathematical Journal, Tome 68 (2018) no. 3, pp. 771-789. doi: 10.21136/CMJ.2018.0646-16

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