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\begin{document}$$\varOmega $$\end{document} be a proper open subset of Rn\documentclass[12pt]{minimal}
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\begin{document}$${\mathbb {R}}^n$$\end{document} and p(·):Ω→(0,∞)\documentclass[12pt]{minimal}
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\begin{document}$$p(\cdot ):\varOmega \rightarrow (0,\infty )$$\end{document} a variable exponent function satisfying the globally log-Hölder continuous condition. In this article, the author introduces the variable Hardy space Hp(·)(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$H^{p(\cdot )}(\varOmega )$$\end{document} on Ω\documentclass[12pt]{minimal}
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\begin{document}$$\varOmega $$\end{document} by the radial maximal function and then characterize the space Hp(·)(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$H^{p(\cdot )}(\varOmega )$$\end{document} via grand maximal functions and atoms. Moreover, the author introduces the variable BMO\documentclass[12pt]{minimal}
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\begin{document}$$\rm {BMO}$$\end{document} space BMOp(·)(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$\rm {BMO}^{p(\cdot )}(\varOmega )$$\end{document} and the variable Hölder space Λp(·),q,d(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$\varLambda ^{p(\cdot ),\,q,\,d}(\varOmega )$$\end{document} on Ω\documentclass[12pt]{minimal}
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\begin{document}$$\varOmega $$\end{document}. As applications of atomic characterizations of Hp(·)(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$H^{p(\cdot )}(\varOmega )$$\end{document}, the author shows that Λp(·),q,d(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$\varLambda ^{p(\cdot ),\,q,\,d}(\varOmega )$$\end{document} is the dual space of Hp(·)(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$H^{p(\cdot )}(\varOmega )$$\end{document}. In particular, when Ω\documentclass[12pt]{minimal}
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\begin{document}$$\varOmega $$\end{document} is a bounded Lipschitz domain in Rn\documentclass[12pt]{minimal}
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\begin{document}$${\mathbb {R}}^n$$\end{document}, the author further obtains Hp(·)(Ω)=Hrp(·)(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$H^{p(\cdot )}(\varOmega )=H^{p(\cdot )}_{r}(\varOmega )$$\end{document}, BMOp(·)(Ω)=BMOzp(·)(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$\rm {BMO}^{p(\cdot )}(\varOmega ) =\rm {BMO}^{p(\cdot )}_z(\varOmega )$$\end{document} and Λp(·),q,0(Ω)=Λzp(·),q,0(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$\varLambda ^{p(\cdot ),\,q,\,0}(\varOmega )=\varLambda ^{p(\cdot ),\,q,\,0}_z(\varOmega )$$\end{document} with equivalent (quasi-)norm. Here the variable Hardy space Hrp(·)(Ω)\documentclass[12pt]{minimal}
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\begin{document}$$H^{p(\cdot )}_{r}(\varOmega )$$\end{document} is defined via restricting arbitrary elements of Hp(·)(Rn)\documentclass[12pt]{minimal}
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\begin{document}$$H^{p(\cdot )}({\mathbb {R}}^n)$$\end{document} to Ω\documentclass[12pt]{minimal}
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\begin{document}$$\varOmega $$\end{document}, BMOzp(·)(Ω):={f∈BMOp(·)(Rn):supp(f)⊂Ω¯}\documentclass[12pt]{minimal}
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\begin{document}$$\rm {BMO}^{p(\cdot )}_z(\varOmega ):=\{f\in \rm {BMO}^{p(\cdot )}({\mathbb {R}}^n):\ {{\,\rm{supp}\,}} (f)\subset {\overline{\varOmega }}\}$$\end{document} and Λzp(·),q,d(Ω):={f∈Λp(·),q,d(Rn):supp(f)⊂Ω¯}\documentclass[12pt]{minimal}
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\begin{document}$$\varLambda ^{p(\cdot ),\,q,\,d}_z(\varOmega ): =\{f\in \varLambda ^{p(\cdot ),\,q,\,d}({\mathbb {R}}^n):\ {{\,\rm{supp}\,}} (f)\subset {\overline{\varOmega }}\}$$\end{document}, where Hp(·)(Rn)\documentclass[12pt]{minimal}
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\begin{document}$$H^{p(\cdot )}({\mathbb {R}}^n)$$\end{document}, BMOp(·)(Rn)\documentclass[12pt]{minimal}
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\begin{document}$$\rm {BMO}^{p(\cdot )}({\mathbb {R}}^n)$$\end{document} and Λp(·),q,d(Rn)\documentclass[12pt]{minimal}
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\begin{document}$$\varLambda ^{p(\cdot ),\,q,\,d}({\mathbb {R}}^n)$$\end{document}, respectively, denote the variable Hardy space, the variable BMO\documentclass[12pt]{minimal}
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\begin{document}$$\rm {BMO}$$\end{document} space and the variable Hölder space on Rn\documentclass[12pt]{minimal}
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\begin{document}$${\mathbb {R}}^n$$\end{document}, and Ω¯\documentclass[12pt]{minimal}
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\begin{document}$${\overline{\varOmega }}$$\end{document} denotes the closure of Ω\documentclass[12pt]{minimal}
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\begin{document}$$\varOmega $$\end{document} in Rn\documentclass[12pt]{minimal}
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\begin{document}$${\mathbb {R}}^n$$\end{document}. The above results extend the main results in Miyachi (Studia Math 95:205–228, 1990) to the case of variable exponents.
