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  1. No Access

    Article

    Erratum to: Generalized fractional maximal and integral operators on Orlicz and generalized Orlicz–Morrey spaces of the third kind

    Fatih Deringoz, Vagif S. Guliyev, Eiichi Nakai, Yoshihiro Sawano, Minglei Shi in Positivity (2024)

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    Article

    Compactness of Commutators of Integral Operators with Functions in Campanato Spaces on Orlicz-Morrey Spaces

    We consider the commutators [bT] and \([b,I_{\rho }]\) [ b ...

    Satoshi Yamaguchi, Eiichi Nakai in Journal of Fourier Analysis and Applications (2022)

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    Article

    Atomic and Wavelet Characterization of Musielak–Orlicz Hardy Spaces for Generalized Orlicz Functions

    The goal of this paper is to obtain atomic and wavelet characterizations of Musielak–Orlicz Hardy spaces. Recently, in 2018, Fu and Yang obtained wavelet characterizations of Musielak–Orlicz Hardy spaces for g...

    Mitsuo Izuki, Eiichi Nakai, Yoshihiro Sawano in Integral Equations and Operator Theory (2021)

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    Article

    Commutators of integral operators with functions in Campanato spaces on Orlicz-Morrey spaces

    We consider the commutators [bT] and \([b,I_{\rho }]\) [ b ...

    Minglei Shi, Ryutaro Arai, Eiichi Nakai in Banach Journal of Mathematical Analysis (2020)

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    Article

    Campanato–Morrey spaces for the double phase functionals

    We prove that the Riesz potential operator \(I_\alpha \) I α of order \(\alpha \) α embeds from Musielak–Orlicz–Morrey spaces \(L^{\Phi ,\nu }(\mathbf{R}^N)\) L Φ , ν ( R N ) of the doub...

    Yoshihiro Mizuta, Eiichi Nakai, Takao Ohno in Revista Matemática Complutense (2020)

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    Article

    Generalized fractional maximal and integral operators on Orlicz and generalized Orlicz–Morrey spaces of the third kind

    In the present paper, we will characterize the boundedness of the generalized fractional integral operators \(I_{\rho }\) ...

    Fatih Deringoz, Vagif S. Guliyev, Eiichi Nakai, Yoshihiro Sawano, Minglei Shi in Positivity (2019)

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    Article

    Commutators of Calderón–Zygmund and generalized fractional integral operators on generalized Morrey spaces

    We consider the commutators [bT] and \([b,I_{\rho }]\) ...

    Ryutaro Arai, Eiichi Nakai in Revista Matemática Complutense (2018)

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    Article

    Singular and fractional integral operators on preduals of Campanato spaces with variable growth condition

    We investigate the boundedness of singular and fractional integral operators on generalized Hardy spaces defined on spaces of homogeneous type, which are preduals of Campanato spaces with variable growth condi...

    Eiichi Nakai in Science China Mathematics (2017)

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    Chapter and Conference Paper

    Pointwise Multipliers on Musielak-Orlicz-Morrey Spaces

    In this paper we characterize pointwise multipliers from a Musielak-Orlicz-Morrey space to another Musielak-Orlicz-Morrey space. The set of all pointwise multipliers is also a Musielak-Orlicz-Morrey space.

    Eiichi Nakai in Function Spaces and Inequalities (2017)

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    Article

    Characterizations of variable exponent Hardy spaces via Riesz transforms

    Let \(p(\cdot ):\ \mathbb R^n\rightarrow (0,\infty )\) ...

    Dachun Yang, Ciqiang Zhuo, Eiichi Nakai in Revista Matemática Complutense (2016)

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    Article

    Generalized fractional maximal operators and vector-valued inequalities on generalized Orlicz–Morrey spaces

    In the present paper, we shall give a necessary and sufficient condition for the weak/strong boundedness of generalized fractional maximal operators on generalized Orlicz–Morrey spaces. We also give necessary ...

    Denny Ivanal Hakim, Eiichi Nakai, Yoshihiro Sawano in Revista Matemática Complutense (2016)

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    Article

    Orlicz-Hardy spaces and their duals

    We establish the theory of Orlicz-Hardy spaces generated by a wide class of functions. The class will be wider than the class of all the N-functions. In particular, we consider the non-smooth atomic decomposition...

    Eiichi Nakai, Yoshihiro Sawano in Science China Mathematics (2014)

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    Article

    Evaluation of two- and three-dimensional visualization for endoscopic endonasal surgery using a novel stereoendoscopic system in a novice: a comparison on a dry laboratory model

    Three-dimensional (3-D) stereoscopic vision is theoretically superior to two-dimensional (2-D) vision in endoscopic endonasal surgery. However, only few reports have quantitatively compared endoscopic performa...

    Yu Kawanishi, Yasunori Fujimoto, Naoko Kumagai, Mitsuhiro Takemura in Acta Neurochirurgica (2013)

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    Article

    Integral operators on B σ -Morrey-Campanato spaces

    We show the boundedness of the Hardy-Littlewood maximal operator, singular and fractional integral operators, and more general sublinear operators on B σ -Morrey...

    Yasuo Komori-Furuya, Katsuo Matsuoka, Eiichi Nakai in Revista Matemática Complutense (2013)

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    Article

    Maximal functions, Riesz potentials and Sobolev embeddings on Musielak-Orlicz-Morrey spaces of variable exponent in \({\bf R}^{n}\)

    Our aim in this paper is to deal with Sobolev embeddings for Riesz potentials of variable order with functions in variable exponent Musielak-Orlicz-Morrey spaces.

    Yoshihiro Mizuta, Eiichi Nakai, Takao Ohno in Revista Matemática Complutense (2012)

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    Article

    Gagliardo–Nirenberg inequality for generalized Riesz potentials of functions in Musielak-Orlicz spaces

    The aim of this paper is to give a Gagliardo–Nirenberg inequality for generalized Riesz potentials of functions in Musielak-Orlicz spaces over spaces of homogeneous type.

    Yoshihiro Mizuta, Eiichi Nakai, Yoshihiro Sawano, Tetsu Shimomura in Archiv der Mathematik (2012)

  17. No Access

    Article

    Pointwise multipliers of Orlicz spaces

    We show that the result on multipliers of Orlicz spaces holds in general. Namely, under the assumption that three Young functions Φ1, Φ2 and Φ, generating corresponding Orlicz spaces, satisfy the estimate ...

    Lech Maligranda, Eiichi Nakai in Archiv der Mathematik (2010)

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    Article

    Singular and fractional integral operators on Campanato spaces with variable growth conditions

    Let X be a space of homogeneous type in the sense of Coifman and Weiss. In this paper, we prove boundedness of singular and fractional integral operators on Campanato spaces over X with variable growth conditions...

    Eiichi Nakai in Revista Matemática Complutense (2010)

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    Article

    Construction of solutions for the initial value problem of a functional-differential equation of advanced type

    Let λ > 1 and \(a \in {\mathbb{R}}, a \neq 0\) . We give a method to construct solutions for the initial value problem...

    Eiichi Nakai, Tsuyoshi Yoneda in Aequationes mathematicae (2009)

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    Article

    A generalization of Hardy spaces H p by using atoms

    Let X = (X, d, µ) be a space of homogeneous type in the sense of Coifman and Weiss. The purpose of this paper is to generalize the definition of Hardy space H p ...

    Eiichi Nakai in Acta Mathematica Sinica, English Series (2008)

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