On isometric domains of positive operators on -spaces
Ryszard Grząślewicz (1987)
Colloquium Mathematicae
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Ryszard Grząślewicz (1987)
Colloquium Mathematicae
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Jin Cai Wang (2003)
Commentationes Mathematicae Universitatis Carolinae
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We use Simonenko quantitative indices of an -function to estimate two parameters and in Orlicz function spaces with Orlicz norm, and get the following inequality: , where and are Simonenko indices. A similar inequality is obtained in with Orlicz norm.
Andrzej Kasperski (2005)
Banach Center Publications
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We introduce the Musielak-Orlicz space of multifunctions and the set of φ-integrable selections of F. We show that some decomposable sets in Musielak-Orlicz space belong to . We generalize Theorem 3.1 from [6]. Also, we get some theorems on the space and the set .
Agata Narloch (2005)
Banach Center Publications
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Criteria for full k-rotundity (k ∈ ℕ, k ≥ 2) and uniform rotundity in every direction of Calderón-Lozanovskiĭ spaces are formulated. A characterization of -points in these spaces is also given.
L. Aharouch, E. Azroul, M. Rhoudaf (2006)
Applicationes Mathematicae
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We prove the existence of solutions of the unilateral problem for equations of the type Au - divϕ(u) = μ in Orlicz spaces, where A is a Leray-Lions operator defined on , and .
Barry Turett
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CONTENTSIntroduction............................................................................... 51. Definitions and preliminary results......................................... 72. Completeness of .............................. 93. Linear functionals on ....................... 264. Geometry of Fenchel-Orlicz spaces........................................ 41References....................................................................................... 54
Anna Kamińska, Karol Leśnik, Yves Raynaud (2014)
Studia Mathematica
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For an Orlicz function φ and a decreasing weight w, two intrinsic exact descriptions are presented for the norm in the Köthe dual of the Orlicz-Lorentz function space or the sequence space , equipped with either the Luxemburg or Amemiya norms. The first description is via the modular , where f* is the decreasing rearrangement of f, ≺ denotes submajorization, and φ⁎ is the complementary function to φ. The second description is in terms of the modular ,where (f*)⁰ is Halperin’s level...
Chen Shutao
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CONTENTSPreface..............................................................................................................................4Introduction........................................................................................................................51. Orlicz spaces..................................................................................................................6 1.1. Orlicz functions...........................................................................................................6 1.2....
Pei-Kee Lin, Huiying Sun (1997)
Annales Polonici Mathematici
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Let ϕ: ℝ → ℝ₊ ∪ 0 be an even convex continuous function with ϕ(0) = 0 and ϕ(u) > 0 for all u > 0 and let w be a weight function. u₀ and v₀ are defined by u₀ = supu: ϕ is linear on (0,u), v₀=supv: w is constant on (0,v) (where sup∅ = 0). We prove the following theorem. Theorem. Suppose that (respectively, ) is an order continuous Lorentz-Orlicz space. (1) has normal structure if and only if u₀ = 0 (respectively, (2) has weakly normal structure if and only if .
Zenon Zbąszyniak (2011)
Banach Center Publications
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We will present relationships between the modular ρ* and the norm in the dual spaces in the case when a Musielak-Orlicz space is equipped with the Orlicz norm. Moreover, criteria for extreme points of the unit sphere of the dual space will be presented.
Maciej Burnecki (2008)
Banach Center Publications
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We consider an embedding of the group of invertible transformations of [0,1] into the algebra of bounded linear operators on an Orlicz space. We show that if this embedding preserves the group action then the Orlicz space is an -space for some 1 ≤ p < ∞.
Pascal Lefèvre, Daniel Li, Hervé Queffélec, Luis Rodríguez-Piazza (2011)
Studia Mathematica
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We study the canonical injection from the Hardy-Orlicz space into the Bergman-Orlicz space .
Ron C. Blei (1982)
Colloquium Mathematicae
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Z. D. Ren (2010)
Annales Polonici Mathematici
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A new lower bound for the Jung constant of the Orlicz sequence space defined by an N-function Φ is found. It is proved that if is reflexive and the function tΦ’(t)/Φ(t) is increasing on , then . Examples in Section 3 show that the above estimate is better than in Zhang’s paper (2003) in some cases and that the results given in Yan’s paper (2004) are not accurate.
Marian Nowak, Agnieszka Oelke (2008)
Banach Center Publications
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We study linear operators from a non-locally convex Orlicz space to a Banach space . Recall that a linear operator is said to be σ-smooth whenever in implies . It is shown that every σ-smooth operator factors through the inclusion map , where Φ̅ denotes the convex minorant of Φ. We obtain the Bochner integral representation of σ-smooth operators . This extends some earlier results of J. J. Uhl concerning the Bochner integral representation of linear operators defined on...
Ibrahim Akbarbaglu, Saeid Maghsoudi (2012)
Colloquium Mathematicae
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Let G be a locally compact group with a fixed left Haar measure. Given Young functions φ and ψ, we consider the Orlicz spaces and on a non-unimodular group G, and, among other things, we prove that under mild conditions on φ and ψ, the set is well defined on G is σ-c-lower porous in . This answers a question raised by Głąb and Strobin in 2010 in a more general setting of Orlicz spaces. We also prove a similar result for non-compact locally compact groups.
Emmanuelle Lavergne (2008)
Colloquium Mathematicae
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We show that when the conjugate of an Orlicz function ϕ satisfies the growth condition Δ⁰, then the reflexive subspaces of are closed in the L¹-norm. For that purpose, we use (and give a new proof of) a result of J. Alexopoulos saying that weakly compact subsets of such have equi-absolutely continuous norm.
N. Kalton (1993)
Studia Mathematica
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We examine conditions under which a pair of rearrangement invariant function spaces on [0,1] or [0,∞) form a Calderón couple. A very general criterion is developed to determine whether such a pair is a Calderón couple, with numerous applications. We give, for example, a complete classification of those spaces X which form a Calderón couple with We specialize our results to Orlicz spaces and are able to give necessary and sufficient conditions on an Orlicz function F so that the pair...
Marian Nowak (2011)
Banach Center Publications
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Let (Ω,Σ,μ) be a finite measure space and let X be a real Banach space. Let be the Orlicz-Bochner space defined by a Young function Φ. We study the relationships between Dunford-Pettis operators T from L¹(X) to a Banach space Y and the compactness properties of the operators T restricted to . In particular, it is shown that if X is a reflexive Banach space, then a bounded linear operator T:L¹(X) → Y is Dunford-Pettis if and only if T restricted to is -compact.
Nguyen Thanh Chung (2015)
Annales Polonici Mathematici
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We consider Kirchhoff type problems of the form ⎧ -M(ρ(u))(div(a(|∇u|)∇u) - a(|u|)u) = K(x)f(u) in Ω ⎨ ⎩ ∂u/∂ν = 0 on ∂Ω where , N ≥ 3, is a smooth bounded domain, ν is the outward unit normal to ∂Ω, , M: [0,∞) → ℝ is a continuous function, , and f: ℝ → ℝ is a continuous function not satisfying the Ambrosetti-Rabinowitz type condition. Using variational methods, we obtain some existence and multiplicity results.
E. Harboure, O. Salinas, B. Viviani (2002)
Colloquium Mathematicae
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Let ϕ and ψ be functions defined on [0,∞) taking the value zero at zero and with non-negative continuous derivative. Under very mild extra assumptions we find necessary and sufficient conditions for the fractional maximal operator , associated to an open bounded set Ω, to be bounded from the Orlicz space into , 0 ≤ α < n. For functions ϕ of finite upper type these results can be extended to the Hilbert transform f̃ on the one-dimensional torus and to the fractional integral operator...
Ajay K. Sharma, S. Ueki (2012)
Annales Polonici Mathematici
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We characterize compact composition operators acting on weighted Bergman-Orlicz spaces , where α > -1 and ψ is a strictly increasing, subadditive convex function defined on [0,∞) and satisfying ψ(0) = 0, the growth condition and the Δ₂-condition. In fact, we prove that is compact on if and only if it is compact on the weighted Bergman space .
Joscha Prochno, Carsten Schütt (2012)
Studia Mathematica
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Let M₁ and M₂ be N-functions. We establish some combinatorial inequalities and show that the product spaces are uniformly isomorphic to subspaces of L₁ if M₁ and M₂ are “separated” by a function , 1 < r < 2.
Agnieszka Kałamajska, Katarzyna Pietruska-Pałuba (2006)
Colloquium Mathematicae
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We obtain interpolation inequalities for derivatives: , and their counterparts expressed in Orlicz norms: ||∇f||²(q,α) ≤ C||Φ₁(x,|f|,|∇(2)f|)||(p,β) ||Φ₂(x,|f|,|∇(2)f|)||(r,γ)where is the Orlicz norm relative to the function . The parameters p,q,r,α,β,γ and the Carathéodory functions Φ₁,Φ₂ are supposed to satisfy certain consistency conditions. Some of the classical Gagliardo-Nirenberg inequalities follow as a special case. Gagliardo-Nirenberg inequalities in logarithmic spaces...
Sonia Acinas, Fernando Mazzone (2017)
Annales Universitatis Mariae Curie-Sklodowska, sectio A – Mathematica
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In this paper, we obtain existence results of periodic solutions of hamiltonian systems in the Orlicz-Sobolev space . We employ the direct method of calculus of variations and we consider a potential function satisfying the inequality , with and certain -functions .
Hasan P. Aghababa, Ibrahim Akbarbaglu, Saeid Maghsoudi (2013)
Studia Mathematica
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Let G be a locally compact group, let (φ,ψ) be a complementary pair of Young functions, and let and be the corresponding Orlicz spaces. Under some conditions on φ, we will show that for a Banach -submodule X of , the multiplier space is a dual Banach space with predual , where the closure is taken in the dual space of . We also prove that if is a Δ₂-regular N-function, then , the space of convolutors of , is identified with the dual of a Banach algebra of functions on G...
Jonatan Vasilis (2010)
Studia Mathematica
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A real-valued Hardy space related to the square root of the Poisson kernel in the unit disc is defined. The space is shown to be strictly larger than its classical counterpart H¹(). A decreasing function is in if and only if the function is in the Orlicz space LloglogL(). In contrast to the case of H¹(), there is no such characterization for general positive functions: every Orlicz space strictly larger than L log L() contains positive functions which do not belong to , and no Orlicz...
Victor Bible (2014)
Studia Mathematica
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The aim of this paper is to present a tool used to show that certain Banach spaces can be endowed with smooth equivalent norms. The hypothesis uses particular countable decompositions of certain subsets of , namely boundaries. Of interest is that the main result unifies two quite well known results. In the final section, some new corollaries are given.
Hidemitsu Wadade (2010)
Studia Mathematica
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We present several continuous embeddings of the critical Besov space . We first establish a Gagliardo-Nirenberg type estimate , for 1 < p ≤ q < ∞, 1 ≤ ν < ρ ≤ ∞ and the weight function with 0 < r < n. Next, we prove the corresponding Trudinger type estimate, and obtain it in terms of the embedding , where the function Φ₀ of the weighted Besov-Orlicz space is a Young function of the exponential type. Another point of interest is to embed into the weighted Besov...
Ron Kerman, Luboš Pick (2011)
Studia Mathematica
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We study imbeddings of the Sobolev space : = u: Ω → ℝ with < ∞ when |α| ≤ m, in which Ω is a bounded Lipschitz domain in ℝⁿ, ϱ is a rearrangement-invariant (r.i.) norm and 1 ≤ m ≤ n - 1. For such a space we have shown there exist r.i. norms, and , that are optimal with respect to the inclusions . General formulas for and are obtained using the -method of interpolation. These lead to explicit expressions when ϱ is a Lorentz Gamma norm or an Orlicz norm.
Ron Kerman, Luboš Pick (2008)
Studia Mathematica
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We find necessary and sufficient conditions on a pair of rearrangement-invariant norms, ϱ and σ, in order that the Sobolev space be compactly imbedded into the rearrangement-invariant space , where Ω is a bounded domain in ℝⁿ with Lipschitz boundary and 1 ≤ m ≤ n-1. In particular, we establish the equivalence of the compactness of the Sobolev imbedding with the compactness of a certain Hardy operator from into . The results are illustrated with examples in which ϱ and σ are both...